1. Curvature Blindness Illusion
What do you see in the center of the above image: curvy lines or zigzag ones? Most people see both — double wavy lines and double angled lines alternating. Now look at the lines as they appear over the black and white area of the photo. What do you see now? The truth is all the lines are wavy.
2. The Spinning Dancer Illusion
This image shows a female dancer pirouetting in a continuous loop. The illusion has to do with the direction in which she is spinning. Viewers will initially think that she is turning in either a clockwise or counterclockwise direction. However, when observing the image at other times, the same viewer may feel absolutely certain that the dancer is spinning in the opposite direction. In reality, this animation is on a continuous loop and does not suddenly change directions.
Why is it impossible to define the direction of the spin?
Because there aren't enough clues about the depth of the dancer image, no one can define the direction of her spin with absolute certainty. The image is a silhouette, so the dancer’s pony tail or extended arm can only be seen when she's facing to the side. They disappear from view at the critical moment when we need them to provide information about depth and direction.
3. Ames Room
The Ames Room is one of the best (and most famous) examples of how perception is not always the same as the reality of what's in front of them. When viewed from the front, an Ames Room appears to be a normal, square room with walls perpendicular to floor and ceiling. However, the back wall is in fact built at a sharp angle and the floor and ceiling are steeply slanted.
This creates an illusion that makes people and objects on one side of the room seem much smaller or larger than people or objects on the other side of the room. Since perspective is important, many Ames Room models have some sort of pinhole viewing device so that the viewer sees the room from an angle where they cannot perceive the slanted floor and the different lengths of the walls
4. Cafe Wall Illusion
The so-called Cafe Wall Illusion has been described as a checkerboard with the squares slightly jumbled or off-kilter. The alternating light and dark squares do not line up directly with the squares on the rows above and below them. The result is that the horizontal lines in between each row appear to be slanted. In reality, the horizontal lines are perfectly parallel with one another and totally straight.
The Cafe Wall Illusion (named after a wall in a Bristol cafe that inspired the idea) is similar to the Zollner Illusion, in which short line patterns are drawn across longer parallel lines at different angles to make the longer lines seem slanted when, in fact, they are perfectly straight. Most theories for explaining why the eye is fooled by such patterns have to do with people first focusing on the contrast between the light and dark spaces. They subconsciously use this contrast to define all the other shapes in the image in their mind even before they have focused on all the parts of the picture.
5. Simultaneous Contrast Illusion
In this image, the horizontal bar in the middle of the picture is one solid color. However, the changing gradient behind the bar makes it seem like the color of the bar itself is changing as it goes from left to right. If the viewer uses their hands to block the background, it becomes obvious that the whole bar is indeed only one shade of gray.
This trick shows that people tend to make assumptions based on surroundings rather than looking only at a singular object. This may seem like a flaw in humans' abilities of perception (the inability to look at an object without being influenced by the background), but it could also be seen as a positive trait (being able to look at the "big picture").
6. Penrose Stairs
The Penrose Stairs, also known as the Impossible Staircase, is perhaps one of the most famous of all optical illusions. In this two dimensional image, the four flights of stairs appear to link together so that a climber would go up or down the steps in a continuous loop but never arrive at a higher or lower point.
What do you see in the center of the above image: curvy lines or zigzag ones? Most people see both — double wavy lines and double angled lines alternating. Now look at the lines as they appear over the black and white area of the photo. What do you see now? The truth is all the lines are wavy.
This image shows a female dancer pirouetting in a continuous loop. The illusion has to do with the direction in which she is spinning. Viewers will initially think that she is turning in either a clockwise or counterclockwise direction. However, when observing the image at other times, the same viewer may feel absolutely certain that the dancer is spinning in the opposite direction. In reality, this animation is on a continuous loop and does not suddenly change directions.
Why is it impossible to define the direction of the spin?
Because there aren't enough clues about the depth of the dancer image, no one can define the direction of her spin with absolute certainty. The image is a silhouette, so the dancer’s pony tail or extended arm can only be seen when she's facing to the side. They disappear from view at the critical moment when we need them to provide information about depth and direction.
The Ames Room is one of the best (and most famous) examples of how perception is not always the same as the reality of what's in front of them. When viewed from the front, an Ames Room appears to be a normal, square room with walls perpendicular to floor and ceiling. However, the back wall is in fact built at a sharp angle and the floor and ceiling are steeply slanted.
This creates an illusion that makes people and objects on one side of the room seem much smaller or larger than people or objects on the other side of the room. Since perspective is important, many Ames Room models have some sort of pinhole viewing device so that the viewer sees the room from an angle where they cannot perceive the slanted floor and the different lengths of the walls
The so-called Cafe Wall Illusion has been described as a checkerboard with the squares slightly jumbled or off-kilter. The alternating light and dark squares do not line up directly with the squares on the rows above and below them. The result is that the horizontal lines in between each row appear to be slanted. In reality, the horizontal lines are perfectly parallel with one another and totally straight.
The Cafe Wall Illusion (named after a wall in a Bristol cafe that inspired the idea) is similar to the Zollner Illusion, in which short line patterns are drawn across longer parallel lines at different angles to make the longer lines seem slanted when, in fact, they are perfectly straight. Most theories for explaining why the eye is fooled by such patterns have to do with people first focusing on the contrast between the light and dark spaces. They subconsciously use this contrast to define all the other shapes in the image in their mind even before they have focused on all the parts of the picture.
In this image, the horizontal bar in the middle of the picture is one solid color. However, the changing gradient behind the bar makes it seem like the color of the bar itself is changing as it goes from left to right. If the viewer uses their hands to block the background, it becomes obvious that the whole bar is indeed only one shade of gray.
This trick shows that people tend to make assumptions based on surroundings rather than looking only at a singular object. This may seem like a flaw in humans' abilities of perception (the inability to look at an object without being influenced by the background), but it could also be seen as a positive trait (being able to look at the "big picture").
The Penrose Stairs, also known as the Impossible Staircase, is perhaps one of the most famous of all optical illusions. In this two dimensional image, the four flights of stairs appear to link together so that a climber would go up or down the steps in a continuous loop but never arrive at a higher or lower point.
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