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You can make your mind perceive two different images in this picture. One is of an old man, while the other is of 2 people standing under an arch. (Alex H)

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The gradients that mimic a 3D effect make this shape seem impossible. And it would be impossible in real life. (Alex H)

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The light and shadow makes the object look impossible to the human eye. (Alex H)

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Because of relative size, it looks like the person in the back is smaller than the hat the woman is holding. This is because the man is farther away and just appears smaller. (Alex H)

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Our eyes make the B seem brighter than it actually is because it's directly under the shade of the cylinder. In reality, it's the same color as the A. (Alex H)

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Because of the triangle covering the other two shapes, we can assume it's closer to us than the other two. (Alex H)

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The road is getting farther away from us. This is shown by seeing the lines of the outer edge slowly closing in and "converging" , which shows our eyes distance. (Alex H)

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The pink circles group together and the blue circles group together because they are similar and form a pattern.
(Alexa T.)

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This is an illusion because you can see both a rabbit and a duck in the image.
(Alexa T)

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The back of the store looks far away because the shelves create converging parallel lines.
(Alexa T.)

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The blue triangle looks the closest because it is blocking the other two triangles.
(Alexa T.)

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The topmost circle looks smaller than the other circles because it is farther away.
(Alexa T.)

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We perceive a square in the middle of the circles even though there are no lines drawing a full square. (Alexa T.)

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The brain groups the circles on the left together into a square shape because they are all in close proximity to each other. The brain groups the circles on the right into columns because they are  close together.
(Alexa T.)

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As you look farther down the rail road, the tracks get closer making it seem like the tracks are actually getting smaller (Scott A)

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The tower and the man are different sizes, but using relative size, the man appears to be taller then the tower. ( Scott A)

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This image shows similarity, the grouping of the triangles and diamond shaped objects create a pattern

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This image is an example of light and shadow. The circles use light and shadow to show indents in the circles (Scott A)

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In this example of an illusion, you stare into the center of the circle and the outer circle starts moving. (Scott A)

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Even though the image is 2-dimensional, our brain perceives it as a 3-D image because the color of the G is much lighter at the top left corner, giving the illusion of light being reflected.

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The line on the top looks bigger than the line on the bottom due to its context. The protruding lines on the top extend out while on the bottom it extends inwards. This tricks the brain into thinking that the top line is longer, even though they are the same.

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Our brains can tell that the bridge is getting farther away because all the lines point to a single conveyance point or vanishing point and our brains can easier distinguish this.

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The images of the horses seem to pop out because our brain is used to pictures staying inside the frame due to our culture of framing pictures we value. However, the image breaks that cultural perception and the horses seem to be escaping the frame. (Justin Yoon)

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As you can see, the sticks or letter in the middle of each word is the same but we recognized what it really is based on the letters that surround them.
-Jasmine B.

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The figure is the black one which is the wine glass in shape and the ground is the white part.
-Jasmine B.

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Similar items are grouped together. Here, bubbles of similar color are grouped together, making it easier to distinguish the number from the background. (Hope Jin)

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The green triangle covers part of the red one, so it loos like the green one is on top. It appears to be closer to us than the red one. (Hope Jin)

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The man looks like he is bigger than the tower even though he is no because he is closer to the camera than the tower is. Things that are closer look bigger. (Hope Jin)

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Our eyes move inward and outward forming different angles to focus on the subject in front of us. (Jules B.)

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Do you see an old woman or a young woman in this picture? Ambiguous figures are images that exploit similar shapes within two different images. For example, on the surface this image looks like a young girl. However, if you focus on the girl's chin and pretend that it is a very large nose, you will se an old woman.
- Alisha M.

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These birds are the same shape even though they are different colors and in different positions.(Daphne D.)

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Due to expectation and past experience, our brains ignore the extra words inside each triangle. (Jules B.)

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Humans tend to group things in patterns when viewing shapes. For example, on the left side of this image you should see a 6x6 square. However, when the square is split up you see 3 2x6 rectangles. We group together the dots based on spacing on the page.
- Alisha M.

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Even though none of these figures are closed, we perceive them as closed figures that are triangles. Our minds like to see things as closed, so we fill in the gaps in out minds. (Hope Jin)

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Though the man is not increasing in size, he is simply placed in different places along the street. Seeing as objects become smaller in the distance, we see the man placed next to the tree and assume he must be as tall as the tree, though it is the same size man as the one furthest right. (Jules B)

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Even if each unit or change in the pattern seems different or looks separate, we see each line as continuous rather than as a discrete unit. (Hope Jin)

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In this image you can see the apple symbol with a bite taken out of it or a man with glasses.This depend on whether you are looking at the white side or the black side.(Daphne D)

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Due to the lines becoming closer together from top to bottom, the narrow top seems much further away than the bottom. The two yellow lines are the same size, but the one further away seems larger because it is placed closer to the top. (Jules B.)

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As you try to look further off into the distance, both of eyes (binocular) will move inward, resulting in the image looking like it is bent and converging in the center of the frame. This is often times an indication of distance and can be manipulated by linear perspective.
- Alisha M.

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In the second photo, it looks like there are two groups of dots because some of them are closer to each other than others. When some things are closer to each other, it looks like there are separate groups. (Hope Jin)

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The center circles in both "flowers" look like they are different sizes. In reality, however they are the same size. They look different because of the content of the image, the 'smaller' center circle, is surrounded by larger circles.

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The center circles in both "flowers" look like they are different sizes. In reality, however they are the same size. They look different because of the content of the image, the 'smaller' center circle, is surrounded by larger circles.

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- Alisha M.

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In this image you can see a pond with trees and a town behind it you can also see face in between the trees.(Daphne D)

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In his image you see one squiggly line and one boxed line. In reality, however, this image is composed of multiple half-rectangle half-circle images. We assume that the lines are continuous even though they are not.
- Alisha M.

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You will see either a man playing the saxophone or a woman's face. This depends on whether you are focusing on the black or the white of the picture.
- Alisha M.

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In this image it appears that there is two different shapes we often group them together and think they use the same function.(Daphne D)

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In this image you can see there is no exact outline of the panda but due the black shapes you can make out a panda which means this image has closure.(Daphne D)

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When looking at the image, one can either see a tree or a gorilla and a lion each looking at each other. It depends on whether you are focusing on the black or the white. (Hope Jin)

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Here, the shades of grey in the middle of the squares are actually all the same color, our brains just don't perceive this correctly because of the lighter and darker colors surrounding the small grey boxes.
-Kaitlin G

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Here, because of the way the black and white boxes are shaded, the parallel lines appear to be slanted. This is called an illusion because your brain uses prior knowledge or other things to interpret the image, and it interprets it wrong
-Kaitlin G

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Because the three balls are all shaded different ways, our minds interpret it as the light hitting them at different angles. With the first one however, it has no shading, making it appear flat.
-Kaitlin G

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Here, the train tracks look like theyre going off into the distance. this is because our eyes perceive depth. We know the two lines are actually parallel, so since they're getting closer together, the tracks appear to be going away.
-Kaitlin G

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Here, we assume that the orange present is the closest, the green present is in the middle, and the pink present is in the back because the boxes are overlapping.
-Kaitlin G

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Here, since we know the balls are all the same size, we can tell that the ones that are smaller are actually further away, not physically smaller.
-Kaitlin Greiner

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Grouped squares having the same shape pattern continuously despite having two different colors. (Melia V.)

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Though there is no outline of the zebra, the stripes start, end, and bend in ways that the brain sees as a zebra
-Kaitlin G

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Counting how many legs does this elephant have is pretty tricky. Depending how you view it, you'll see four to higher of legs in total. (Melia

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Focusing on the figure, you'll see multiple birds and a tree. If focusing on the ground, you'll see a face of a woman. (Melia

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Rather than identifying the circles individually, we group them into columns and rows altogether. (Melia V.)

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The other person may have look smaller due the distance, but as he got closer to the other guy, they are just the same size. (Melia V.)

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When looking at this image, you will either see a full face taking up much of the image or a woman walking on the street past a group of trees. 

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When looking at this image, you will either see a full face taking up much of the image or a woman walking on the street past a group of trees. 

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izzy Crume

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The shadow gives the shape more of three-dimensional look rather than two-dimensional. (Melia V.)

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Every brain is slightly different in the way people view a certain image. This is a group of individuals all looking at the same sign while seeing what their brain tells them what it is. 

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Every brain is slightly different in the way people view a certain image. This is a group of individuals all looking at the same sign while seeing what their brain tells them what it is. 

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-izzy crume

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The classic duck and bunny image is the perfect illusion. When quickly glancing at the image you will see a bunny eating the grass. If you were to look deeper into the image you would find it to be the front region of a duck facing the sky. 

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The classic duck and bunny image is the perfect illusion. When quickly glancing at the image you will see a bunny eating the grass. If you were to look deeper into the image you would find it to be the front region of a duck facing the sky. 

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Izzy Crume

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You can perceive the image in two different ways as two elders facing each or two young adults enjoying each other's company. (Melia V.)

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The domino that overlaps all of the other dominoes appears to be the closest. The domino behind the others is seen as the one farthest away
(Jasmine K)

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A frog can be seen clearly from a landscape perspective, while a horse appears to be more obvious from a portrait view
(Jasmine K)

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The street appears to continue off into the distance because of the converging parallel lines that seem to meet farther away from the viewer
(Jasmine K)

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In the picture on the left, the footprints look like indents because the shadows extend into the feet. The picture on the right shows the shadows moving away from the feet, making them look like they are higher than the rest of the sand
(Jasmine K)

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In this image, it portrays a woman and a child who will shortly be consumed by a large bucket. However, this image is playing with the way the brain sees things. The bucket is a lot smaller than the people, it is just the distance and angle at which this image was taken that portrays this idea. 

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In this image, it portrays a woman and a child who will shortly be consumed by a large bucket. However, this image is playing with the way the brain sees things. The bucket is a lot smaller than the people, it is just the distance and angle at which this image was taken that portrays this idea. 

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-Izzy Crume

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Because the orange circle on the left is surrounded by larger circles, it is seen as smaller than the orange circle on the right, which is surrounded by smaller circles. However, they are actually the same size.
(Jasmine K)

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The eight ball in front looks larger than the other balls, but this is because it is closer than the others. In reality, they are all the same size
(Jasmine K)

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Depending on what the viewer focuses on, they can either see black birds or white birds.
(Jasmine K)

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The image is just a bunch of shapes together but our brain puts it together to create a panda.
-Marcel Contin

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The image represents relative size because the boy further back looks much smaller even tho they are around the same size in reality.
-Marcel Contin

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if you focus on the black as the ground, you see a row of white vases/figurines. if you focus on the white as the ground, you see four shadowy people bent over slightly. (emma d)

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one famous illusion is mc escher's never-ending staircase. looking at it, it seems like it's just a regular flight of steps you can go up/down on, but the figure is impossible. the steps continually descend in a clockwise direction. (emma d)

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depending on how you look at it, this can be either a kangaroo's head or a full-body seal. (emma d)

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At first of looking at the image you may only see a young woman but once you look closer you can also see an old woman .
-Marcel Contin

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at first you see a chubby, displeased man, but as you go to the right the figure becomes a woman sitting, head turned away. (emma d)

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When you look at the 2 sides of the train track,  the lines in reality are straight but they come in closer when further.
-Marcel Contin

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this image is a similarity concept. the black birds are grouped together, and the white fish are grouped together. (emma d)

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When looking at this picture, one time you can see the man facing forward staring at you. Yet if you look at it again you may see his side profile instead. This creates an illusion of not knowing which way the face is actually facing. (Keertana P.)

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Since the front two circles overlap over the middle one, they appear to be closer because they seem to be the ones on top. (Keertana P.)

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This picture represents the concept of similarity. The similar black dots pair with each other while the white dots pair together.

-Marcel Contin

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This picture shows relative size because the man look much larger than the other person, almost giant like. This is not true because he is just standing closer to the camera, while the boy in the green is just much farther back, creating that illusion. (Keertana P.)

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This picture is an example of continuity even though the arrows are following different paths. We just assume that they are continuous even though they are not. (Keertana P.)

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Upon first glance this picture may seem like a cup but others may see two people about to kiss. Both are correct as both images can be seen. (Keertana P.)

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This image represents proximity. Instead of just seeing  72 dots, we see 2 sets of 36 dots.

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This image represents proximity. Instead of just seeing  72 dots, we see 2 sets of 36 dots.

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-Marcel Contin

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Due to the different ways the light and shadows are hitting the images, some appear to be going inward while others appear to be facing outward. (Keertana P.)

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This picture shows similarity because similar patterns are next to each other repeating, so they are grouped together. (Keertana P.)

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Depending on which area you focus on in this image, you will see either an image representing nature with a tree and birds or the outline of a woman's face. -Aarja Pavade

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When looking at the image, this represents figure ground because  you can see either a violin or a man.

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When looking at the image, this represents figure ground because  you can see either a violin or a man.

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-Marcel Contin

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When trying to look at a close-up object, your eyes looked crossed, because it is necessary in order to see the object you are trying to look at. (Brynna Barnholtz)

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When looking at this picture, it looks like the lines are moving in a circle, but they are not actually moving at all. (Brynna Barnholtz)

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The shading and use of shadows in this drawing, makes the picture look three-dimensional, when it is really just a two-dimensional drawing. (Brynna Barnholtz)

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The black 8- ball appears the largest, because it is the closest ball to the camera. (Brynna Barnholtz)

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Our brains tend to group these lines into 3 sets of 2 lines, due to their proximity, instead of 6 separate lines. -Aarja Pavade

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This picture shows relative size, because the blue bucket looks larger than the two people, but in reality they are bigger than the bucket. Since they are standing further back than the bucket they look smaller, and as if they will be covered by it. (Brynna Barnholtz)

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This image is an example of closure, because although individually it is just a bunch of shapes, together your brain sees a person kicking a ball. (Brynna Barnholtz)