Motion Illusions

This Moving Ball Illusion uses illusory motion to create the perception that the ball is actually moving.

Illusory motion is a perceptual phenomenon in which a stationary image appears to be moving. It occurs when visual cues in the image trick the brain into perceiving motion, even though there is no actual movement taking place. If you are interested, scroll down to learn more about it.

Table of Contents

• What is the Moving Ball Illusion?
• How does the Moving Ball Illusion work?
• Some Similar Illusions
• Discovery of the Moving Ball Illusion
• References and Resources

What is the Moving Ball Illusion?

The Moving Ball Illusion is an example of illusory motion which refers to the perception of movement or motion in a visual stimulus that is actually static or stationary. It is a phenomenon where our brains interpret the visual input in a way that creates a false sense of motion.

Illusory motion like the Moving Ball Illusion can occur through various mechanisms and visual cues, including:

1. Motion Aftereffect: This is a common form of illusory motion where prolonged exposure to a moving stimulus causes a subsequent stationary stimulus to appear to move in the opposite direction. For example, after staring at a waterfall for a while, a static scene may appear to flow upwards.
2. Phi Phenomenon: The phi phenomenon is an illusion of apparent motion that occurs when a series of still images are presented rapidly in succession. It creates the perception of motion between the images, even though each individual image is static.
3. Peripheral Drift Illusion: As mentioned earlier, the peripheral drift illusion creates the perception of motion in a static pattern when viewed peripherally, with elements like radiating lines or concentric circles appearing to rotate or drift.
4. Autokinetic Effect: The autokinetic effect is an illusion of motion experienced when looking at a stationary point of light in an otherwise dark environment. The light appears to move or “twinkle” slightly, even though it is stationary.

In addition to the Moving Ball Illusion, these are just a few examples of illusory motion phenomena. Illusory motion illustrates how our visual system can be influenced by various factors and interpret static stimuli as dynamic or moving. It demonstrates the complexities of visual perception and the brain’s ability to construct a coherent representation of the world based on limited sensory input.

How does the Moving Ball Illusion Work?

Illusory motion like the Moving Ball Illusion occurs due to the complex processing and interpretation of visual stimuli by our brain. While the specific mechanisms can vary depending on the particular illusion, here are some general processes that contribute to illusory motion:

1. Neural Adaptation: Our visual system has neurons that are specialized in detecting and processing motion. When exposed to a moving stimulus for an extended period, these motion-sensitive neurons adapt and become less responsive to the specific motion. As a result, when presented with a stationary stimulus afterward, there can be a mismatch between the adapted neurons and the actual input.
2. Interactions between Neural Pathways: Illusory motion often involves interactions between different neural pathways responsible for detecting motion, processing visual cues, and integrating information. These interactions can create conflicts or discrepancies in the signals being processed, leading to the perception of motion where none exists.
3. Contextual Information: Our brain relies on contextual cues to make sense of visual stimuli. Illusory motion can be influenced by factors such as surrounding patterns, contrast, spatial frequencies, and the overall context in which the stimulus is presented. These contextual cues can trigger certain expectations or biases, leading to the perception of motion.
4. Eye Movements: In some cases, illusory motion may be enhanced or influenced by our eye movements. Fixating on a specific point while observing a dynamic stimulus or shifting gaze across the scene can impact how our brain processes motion information, potentially contributing to illusory motion effects.

The exact mechanisms underlying specific illusions of motion, such as the motion aftereffect or the autokinetic effect, can involve a combination of these factors and others. Different illusions may have unique characteristics and neural processes at play.

Illusory motion like evidenced in the Moving Ball Illusion highlights the sophisticated nature of our visual perception and how our brain constructs a coherent representation of the visual world. It demonstrates how our brain can be deceived by certain patterns, contexts, or adaptational processes, leading to the compelling illusion of motion.

Some Similar Illusions to the Moving Ball Illusion

There are several illusions that share similarities with illusory motion seen in the moving ball illusion in terms of creating the perception of movement or dynamic effects. Here are a few examples:

1. Stroboscopic Motion: Stroboscopic motion involves perceiving continuous motion from a series of discrete or intermittent stimuli. For example, the phi phenomenon, mentioned earlier, creates the perception of motion between static images presented in rapid succession.
2. Wagon-Wheel Effect: The wagon-wheel effect is observed when the spokes of a rotating wheel or a propeller appear to move slowly or even backward. It occurs due to the interaction between the rotational speed of the object and the sampling rate of our visual system.
3. Barberpole Illusion: The barberpole illusion is an optical illusion where a vertically oriented barber pole, with alternating red and white stripes, appears to move upward or downward even though it is stationary. The perceived motion is a result of the diagonal stripes presented at an angle.
4. Waterfall Illusion: The waterfall illusion, also known as the motion aftereffect, involves a stationary scene appearing to move in the opposite direction after prolonged exposure to a downward moving stimulus, such as a waterfall. It occurs due to neural adaptation in the motion-sensitive neurons of the visual system.
5. Pulfrich Effect: The Pulfrich effect occurs when a moving object in a 2D plane appears to have a perceived depth or a swinging motion. It is created by introducing a slight time delay between the perception of the object by each eye, typically achieved using a light filter.

These illusions, like illusory motion, exploit the complex interactions between visual processing, motion perception, and contextual cues. They demonstrate the intricate ways in which our visual system can be influenced, leading to compelling illusions of motion or dynamic effects.

Discovery of the Moving Ball Illusion

Illusory motion like demonstrated in the moving ball illusion, as a phenomenon in visual perception, does not have a specific inventor or creator. Illusory motion has been observed and studied by numerous scientists, psychologists, and researchers over the years. The discovery and understanding of different types of illusory motion have emerged through the collective efforts of scientists working in the field of visual perception and neuroscience.

The study of illusory motion has a rich history, and contributions have been made by researchers from various disciplines. Scientists such as Max Wertheimer, Ernst Mach, Adelbert Ames Jr., and many others have made significant contributions to our understanding of visual illusions and the perception of motion.

It’s important to note that the study of illusory motion is an ongoing field of research, with new insights and discoveries continually emerging. Researchers continue to investigate the underlying mechanisms and neural processes involved in generating illusory motion effects, enhancing our understanding of this fascinating aspect of visual perception.

References and Resources

In addition to the Moving Ball Illusion, check out our complete list of illusions and this awesome similar illusions: Platform 9 3-4, Moving Diamond

This Moving Diamond Illusion is an example of peripheral drift. The peripheral drift illusion, also known as the Fraser-Wilcox illusion, is a visual phenomenon that creates the perception of motion or apparent movement in static images. It involves a specific pattern consisting of radiating lines or concentric circles that appear to rotate or move when observed peripherally.

Table of Contents

• What is the Moving Diamond Illusion?
• How does the Moving Diamond Illusion work?
• Some Similar Illusions
• Discovery of the Moving Diamond Illusion
• References and Resources

What is the Moving Diamond Illusion?

The Moving Diamond Illusion is a type of peripheral drift illusion, also known as the Fraser-Wilcox illusion, which is a visual phenomenon that creates the perception of motion or apparent movement in static images. It involves a specific pattern consisting of radiating lines or concentric circles that appear to rotate or move when observed peripherally.

Here’s how the peripheral drift illusion typically works:

1. Visual Stimulus: The illusion often involves a design with radial lines or concentric circles that extend from a central point.
2. Fixation: When you focus your gaze directly on the central point of the pattern, the lines or circles may appear stationary.
3. Peripheral Vision: As you shift your gaze or direct your attention to the outer edges of the pattern while keeping your eyes still, you may perceive an illusory sense of motion. The lines or circles might seem to rotate, drift, or pulsate in a continuous manner.

The peripheral drift illusion relies on the interaction between our eye movements, visual perception, and the specific design characteristics of the pattern. The illusory motion experienced in the periphery is thought to be related to the way our visual system processes motion and spatial information.

Moving Diamond Illusion can vary in its strength and effectiveness from person to person, and different variations of the illusion may produce slightly different perceptual experiences.

How does the Moving Diamond Illusion Work?

The Moving Diamond Illusion is a type of peripheral drift illusions and the exact mechanisms underlying the peripheral drift illusion are still a subject of scientific investigation. However, there are several theories and explanations that attempt to shed light on how this illusion works. Here are some key factors that contribute to the perception of motion in the peripheral drift illusion:

1. Eye Movements: The peripheral drift illusion often involves fixating on a central point while allowing your eyes to move or scan the periphery of the pattern. These eye movements play a crucial role in generating the illusion of motion. As your eyes move, they sample different parts of the image, which can create an impression of movement.
2. Peripheral Vision: Our peripheral vision is sensitive to detecting motion. It is more responsive to changes in contrast and edges than to fine details. The lines or patterns in the peripheral drift illusion are carefully designed to exploit this characteristic. The specific arrangement of lines or circles, along with their contrast and spatial frequency, can trigger the perception of motion in the periphery.
3. Contrast and Spatial Frequency: The contrast and spatial frequency of the pattern elements can influence the strength of the illusion. Optimal contrast and specific spatial frequencies are often employed to enhance the perception of motion. These characteristics can stimulate motion-sensitive neurons in the visual system, leading to the illusory experience of movement.
4. Neural Adaptation: The phenomenon of neural adaptation may also contribute to the peripheral drift illusion. When you fixate on a central point for a prolonged period, neurons in the visual system become less responsive to constant stimulation. As a result, when you shift your attention to the periphery, these “fatigued” neurons might respond more weakly to the stationary pattern, enhancing the perception of motion.

Peripheral drift illusions like Moving Diamond Illusion are still an active area of research, and different theories may offer slightly different explanations for the underlying mechanisms. Further studies are needed to fully understand the complex interplay of neural processes and visual cues involved in generating this intriguing illusion.

Some Similar Illusions

There are several illusions that share similarities with the The Moving Diamond Illusion in terms of creating the perception of motion or movement. Here are a few examples:

1. Rotating Snakes Illusion: The Rotating Snakes Illusion is an optical illusion created by Akiyoshi Kitaoka. It features a series of overlapping patterns that appear to rotate spontaneously when observed. The illusory motion arises due to the interaction between the curved elements and our eye movements.
2. Pinna-Brelstaff Illusion: This illusion involves a pattern of radiating lines or shapes arranged in a spiral or vortex-like formation. When observed while moving closer or farther away from the image, the pattern may appear to rotate in the opposite direction. The perceived motion is a result of the conflicting depth and motion cues presented in the visual stimulus.
3. Enigma Illusion: The Enigma illusion is a dynamic pattern composed of various elements, including concentric circles, lines, and spirals. When viewed peripherally, the pattern seems to pulsate or vibrate subtly. The illusion exploits the receptive field properties of our visual system to create the impression of motion.
4. Lilac Chaser Illusion: The Lilac Chaser is an optical illusion that involves a sequence of fading colored discs arranged in a circle. When you fixate on the central empty space, a green disc appears to disappear and reappear while the surrounding discs rotate in a circular motion. The illusion occurs due to the combination of color afterimages and the perception of motion.

These illusions, like the The Moving Diamond Illusion, rely on various visual cues, eye movements, and neural processes to create the perception of motion or dynamic patterns. They demonstrate the intricate ways in which our visual system processes and interprets visual stimuli, sometimes leading to intriguing perceptual experiences.

Discovery of the Moving Diamond Illusion

The Moving Diamond Illusion is a type of peripheral drift illusion, also known as the Fraser-Wilcox illusion, was discovered by two psychologists, Donald Fraser and Terence Wilcox, in 1979. Donald Fraser, a psychologist at the University of Cambridge, and Terence Wilcox, a psychologist at the University of Toronto, independently reported their observations of the illusion in separate publications.

Fraser initially described the illusion as a “rotating spiral,” while Wilcox referred to it as the “radiating spokes effect.” Both researchers conducted experiments and provided insights into the perceptual mechanisms underlying the illusion. Their contributions helped bring attention to this intriguing visual phenomenon and sparked further research into its underlying mechanisms.

References and Resources

In addition to the Moving Diamond Illusion, check out our complete list of illusions and this awesome similar illusions: Platform 9 3-4 Illusion

This fun Moving Rows Illusion by Akiyoshi Kitaoka uses peripheral drift to create the perception that the rows appear to move when they are completely static.

If you are interested in learning how the Moving Rows Illusion works, scroll down to read more about it.

Table of Contents

• What is the Moving Rows Illusion?
• How does the Moving Rows Illusion work?
• Some Similar Illusions
• Discovery of the Moving Rows Illusion
• References and Resources

What is the Moving Rows Illusion?

The Moving Rows Illusion is an example of Peripheral drift which is a visual illusion that occurs when the edges of an object or pattern appear to be moving or vibrating, even though the object itself is stationary. This illusion is created by specific patterns that are designed to interact with the visual system in a way that produces the perception of movement.

The patterns used to create peripheral drift typically involve high-contrast black and white elements arranged in a circular or spiral pattern. When the pattern is viewed, the edges of the elements appear to be shifting or vibrating, which creates the illusion of movement. The effect is strongest when the pattern is viewed peripherally, meaning that it is viewed using the outer edges of the visual field rather than by looking directly at it.

Peripheral drift is a type of motion illusion, which means that it creates the perception of movement even though there is no actual motion involved. It is thought to be caused by the way that the visual system processes information about the edges and boundaries of objects. The illusion can be used in various contexts, including in art and design, and in the study of visual perception and cognition.

How does the Moving Rows Illusion Work?

The Moving Rows Illusion uses peripheral drift which is a visual illusion that works by exploiting the way that the visual system processes information about edges and boundaries of objects. The specific patterns used to create peripheral drift are designed to interact with the neurons in the visual system that are responsible for processing information about edges and contours.

When the pattern is viewed, the high-contrast elements at the edges of the pattern create a “grating” effect, where the edges appear to be alternating between black and white. This creates a flickering effect at the edges of the pattern that stimulates neurons in the visual system that are sensitive to motion and changes in luminance.

These neurons send signals to the brain that create the perception of movement, even though the pattern itself is stationary. The effect is strongest when the pattern is viewed peripherally, meaning that it is viewed using the outer edges of the visual field rather than by looking directly at it. This is because the neurons that are sensitive to motion and luminance changes are more numerous and densely packed in the periphery of the visual field.

Peripheral drift is just one of many visual illusions that exploit the ways that the visual system processes information about the world. It is a powerful demonstration of the brain’s ability to create the perception of movement and change even when there is no actual motion involved.

Some Similar Illusions

There are many visual illusions that are similar to peripheral drift used in Moving Rows Illusion the in that they create the perception of movement or change where there is none. Here are a few examples:

1. The Rotating Snakes illusion: This illusion features a set of overlapping shapes that appear to be rotating in a clockwise or counterclockwise direction, even though they are not actually moving.
2. The Pinna-Brelstaff illusion: This illusion involves a set of spirals that appear to be moving in a particular direction when the viewer moves their head or eyes, even though the spirals are actually stationary.
3. The Motion Aftereffect illusion: This illusion occurs when the brain perceives motion in the opposite direction of a previously viewed moving stimulus. For example, after staring at a moving image of a waterfall for a period of time, a stationary scene may appear to be moving upwards.
4. The Adelson’s Checker Shadow illusion: This illusion features a checkerboard pattern with a shadow over one section that appears to change the brightness of the squares it covers, even though all of the squares are the same color.

These are just a few examples of the many visual illusions that exist. They are useful tools for studying the ways that the brain processes visual information and creates the perception of movement and change.

Discovery of the Moving Rows Illusion

The Moving Rows Illusion was created by Akiyoshi Kitaoka, a Japanese psychologist and visual perception expert who is known for his research on visual illusions and his creation of many famous optical illusions. He is a professor in the Department of Psychology at Ritsumeikan University in Kyoto, Japan.

Kitaoka’s work has focused on the study of perception, specifically on how the brain processes visual information and creates the experience of seeing. He has developed a number of visual illusions that demonstrate how the brain can be tricked into perceiving things that are not actually there or that are different from reality.

Some of Kitaoka’s most famous illusions include the Rotating Snakes illusion, the Checker Shadow illusion, and the Fraser Spiral illusion. His work has been featured in scientific journals and popular media around the world, and he is considered one of the leading researchers in the field of visual perception.

References and Resources

In addition to the Moving Rows Illusion, check out our complete list of illusions and this awesome Wavy Seeds Illusion and this cool Mona Lisa Bar Illusion.

This cool Wavy Seeds Illusion by Akiyoshi Kitaoka uses peripheral drift to create the perception that the seed like shapes are actually moving when they are completely static.

If you are interested in learning how the Wavy Seeds Illusion works, scroll down to read more about it.

Table of Contents

• What is the Wavy Seeds Illusion?
• How does the Wavy Seeds Illusion work?
• Some Similar Illusions
• Discovery of the Wavy Seeds Illusion
• References and Resources

What is the Wavy Seeds Illusion?

The Wavy Seeds Illusion is an example of Peripheral drift which is a visual illusion that occurs when the edges of an object or pattern appear to be moving or vibrating, even though the object itself is stationary. This illusion is created by specific patterns that are designed to interact with the visual system in a way that produces the perception of movement.

The patterns used to create peripheral drift typically involve high-contrast black and white elements arranged in a circular or spiral pattern. When the pattern is viewed, the edges of the elements appear to be shifting or vibrating, which creates the illusion of movement. The effect is strongest when the pattern is viewed peripherally, meaning that it is viewed using the outer edges of the visual field rather than by looking directly at it.

Peripheral drift is a type of motion illusion, which means that it creates the perception of movement even though there is no actual motion involved. It is thought to be caused by the way that the visual system processes information about the edges and boundaries of objects. The illusion can be used in various contexts, including in art and design, and in the study of visual perception and cognition.

How does the Wavy Seeds Illusion Work?

The Wavy Seeds Illusion uses peripheral drift which is a visual illusion that works by exploiting the way that the visual system processes information about edges and boundaries of objects. The specific patterns used to create peripheral drift are designed to interact with the neurons in the visual system that are responsible for processing information about edges and contours.

When the pattern is viewed, the high-contrast elements at the edges of the pattern create a “grating” effect, where the edges appear to be alternating between black and white. This creates a flickering effect at the edges of the pattern that stimulates neurons in the visual system that are sensitive to motion and changes in luminance.

These neurons send signals to the brain that create the perception of movement, even though the pattern itself is stationary. The effect is strongest when the pattern is viewed peripherally, meaning that it is viewed using the outer edges of the visual field rather than by looking directly at it. This is because the neurons that are sensitive to motion and luminance changes are more numerous and densely packed in the periphery of the visual field.

Peripheral drift is just one of many visual illusions that exploit the ways that the visual system processes information about the world. It is a powerful demonstration of the brain’s ability to create the perception of movement and change even when there is no actual motion involved.

Some Similar Illusions

There are many visual illusions that are similar to peripheral drift used in Wavy Seeds Illusion the in that they create the perception of movement or change where there is none. Here are a few examples:

1. The Rotating Snakes illusion: This illusion features a set of overlapping shapes that appear to be rotating in a clockwise or counterclockwise direction, even though they are not actually moving.
2. The Pinna-Brelstaff illusion: This illusion involves a set of spirals that appear to be moving in a particular direction when the viewer moves their head or eyes, even though the spirals are actually stationary.
3. The Motion Aftereffect illusion: This illusion occurs when the brain perceives motion in the opposite direction of a previously viewed moving stimulus. For example, after staring at a moving image of a waterfall for a period of time, a stationary scene may appear to be moving upwards.
4. The Adelson’s Checker Shadow illusion: This illusion features a checkerboard pattern with a shadow over one section that appears to change the brightness of the squares it covers, even though all of the squares are the same color.

These are just a few examples of the many visual illusions that exist. They are useful tools for studying the ways that the brain processes visual information and creates the perception of movement and change.

Discovery of the Wavy Seeds Illusion

The Wavy Seeds Illusion was created by Akiyoshi Kitaoka, a Japanese psychologist and visual perception expert who is known for his research on visual illusions and his creation of many famous optical illusions. He is a professor in the Department of Psychology at Ritsumeikan University in Kyoto, Japan.

Kitaoka’s work has focused on the study of perception, specifically on how the brain processes visual information and creates the experience of seeing. He has developed a number of visual illusions that demonstrate how the brain can be tricked into perceiving things that are not actually there or that are different from reality.

Some of Kitaoka’s most famous illusions include the Rotating Snakes illusion, the Checker Shadow illusion, and the Fraser Spiral illusion. His work has been featured in scientific journals and popular media around the world, and he is considered one of the leading researchers in the field of visual perception.

References and Resources

In addition to the Wavy Seeds Illusion, check out our complete list of illusions and this awesome Crescent Moon Bridge Illusion and this cool Mona Lisa Bar Illusion and this Moving Rows Illusion

This fun Moving Worms Illusions by Akiyoshi Kitaoka use peripheral drift to create the perception that the worms are actually moving when they are completely static.

If you are interested in learning how the Moving Worms Illusion works, scroll down to read more about it.

Table of Contents

• What is the Moving Worms Illusion?
• How does the Moving Worms Illusion work?
• Some Similar Illusions
• Discovery of the Moving Worms Illusion
• References and Resources

What is the Moving Worms Illusion?

The Moving Worms Illusion is an example of Peripheral drift which is a visual illusion that occurs when the edges of an object or pattern appear to be moving or vibrating, even though the object itself is stationary. This illusion is created by specific patterns that are designed to interact with the visual system in a way that produces the perception of movement.

The patterns used to create peripheral drift typically involve high-contrast black and white elements arranged in a circular or spiral pattern. When the pattern is viewed, the edges of the elements appear to be shifting or vibrating, which creates the illusion of movement. The effect is strongest when the pattern is viewed peripherally, meaning that it is viewed using the outer edges of the visual field rather than by looking directly at it.

Peripheral drift is a type of motion illusion, which means that it creates the perception of movement even though there is no actual motion involved. It is thought to be caused by the way that the visual system processes information about the edges and boundaries of objects. The illusion can be used in various contexts, including in art and design, and in the study of visual perception and cognition.

How does the Moving Worms Illusion Work?

The Moving Worms Illusion uses peripheral drift which is a visual illusion that works by exploiting the way that the visual system processes information about edges and boundaries of objects. The specific patterns used to create peripheral drift are designed to interact with the neurons in the visual system that are responsible for processing information about edges and contours.

When the pattern is viewed, the high-contrast elements at the edges of the pattern create a “grating” effect, where the edges appear to be alternating between black and white. This creates a flickering effect at the edges of the pattern that stimulates neurons in the visual system that are sensitive to motion and changes in luminance.

These neurons send signals to the brain that create the perception of movement, even though the pattern itself is stationary. The effect is strongest when the pattern is viewed peripherally, meaning that it is viewed using the outer edges of the visual field rather than by looking directly at it. This is because the neurons that are sensitive to motion and luminance changes are more numerous and densely packed in the periphery of the visual field.

Peripheral drift is just one of many visual illusions that exploit the ways that the visual system processes information about the world. It is a powerful demonstration of the brain’s ability to create the perception of movement and change even when there is no actual motion involved.

Some Similar Illusions

There are many visual illusions that are similar to peripheral drift used in Moving Worms Illusion the in that they create the perception of movement or change where there is none. Here are a few examples:

1. The Rotating Snakes illusion: This illusion features a set of overlapping shapes that appear to be rotating in a clockwise or counterclockwise direction, even though they are not actually moving.
2. The Pinna-Brelstaff illusion: This illusion involves a set of spirals that appear to be moving in a particular direction when the viewer moves their head or eyes, even though the spirals are actually stationary.
3. The Motion Aftereffect illusion: This illusion occurs when the brain perceives motion in the opposite direction of a previously viewed moving stimulus. For example, after staring at a moving image of a waterfall for a period of time, a stationary scene may appear to be moving upwards.
4. The Adelson’s Checker Shadow illusion: This illusion features a checkerboard pattern with a shadow over one section that appears to change the brightness of the squares it covers, even though all of the squares are the same color.

These are just a few examples of the many visual illusions that exist. They are useful tools for studying the ways that the brain processes visual information and creates the perception of movement and change.

Discovery of the Moving Worms Illusion

The Moving Worms Illusion was created by Akiyoshi Kitaoka, a Japanese psychologist and visual perception expert who is known for his research on visual illusions and his creation of many famous optical illusions. He is a professor in the Department of Psychology at Ritsumeikan University in Kyoto, Japan.

Kitaoka’s work has focused on the study of perception, specifically on how the brain processes visual information and creates the experience of seeing. He has developed a number of visual illusions that demonstrate how the brain can be tricked into perceiving things that are not actually there or that are different from reality.

Some of Kitaoka’s most famous illusions include the Rotating Snakes illusion, the Checker Shadow illusion, and the Fraser Spiral illusion. His work has been featured in scientific journals and popular media around the world, and he is considered one of the leading researchers in the field of visual perception.

References and Resources

In addition to the Moving Worms Illusion, check out our complete list of illusions and this awesome Crescent Moon Bridge Illusion and this cool Mona Lisa Bar Illusion.