 Most people are fascinated by optical illusions. Quite disturbing, how your own eyes can deceive you. And it's interesting material for scientists who want to find out how our perception works. |
Rotating Circles - Grelstaff & Pinna |
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 This is a great illusion ! Look at the black dot in the middle and move you head forward and backward. You will see both circles rotating in different directions ! How does it work ? If you move further away, the circles will become smaller for you. This means every symbol moves inwards, and their slanted edge give the impression of circumferential motion. If the edges are not slanted enough, the illusion doesn't work near as good.
Number of ratings : 612. |
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::  1999 |
| Disappearing Dot - |
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 This is one of the most amazing illusions. Keep staring at the blue dot in the middle of the picture. The blue dot will shrink slowly and then disappear completely !
Number of ratings : 546. |
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| Ferris wheel illusion - |
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 Is the wheel turning to the right or the left ? When you look at the left, it seems to be turning left, when you look to the right, . . . In fact this animation has only two frames, this means there are only two different positions for the wheel. The wheel is not turning at all ; your imagination is filling in the gaps !
Number of ratings : 392. |
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Vortex -  |
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 This is also known as the waterfall illusion. Its effect is based on the lazyness of the movement receptors in the eye. Click on the thumbnail to show the full picture. Stare at the middle of the animation for 20 seconds and then look at the back of your hand . . . The reaction on this animations are quite funny. There is no other image with so many and so different reactions. Most people vote a 1 or a 5 so you could say there's a difference in opinion. Does it suck or rule ?
Number of ratings : 607. |
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| Silhouette - |
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 This image proves that you can't be sure what direction an object is facing if you only look at the silhouette. One line makes the difference between to the front and to the back.
Number of ratings : 604. |
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| Cheese pie - |
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 Is the pie of cheese cut out, or stuck on ?
Number of ratings : 371. |
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| Cubes - |
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 Is this : a room with a box in it, a cube with a smaller cube cut out, or a big cube with a smaller cube in front of it ?
Derived : Moving cube
Number of ratings : 241. |
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| Moving cube - Gianni A. Sarcone |
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 A spectacular animation ! While the cube moves, it switches between a cube with a small cube cut out and a cube with a small cube in front of it, moving in sync. It's more difficult to see a moving room with a box in it.
Original : Cubes
Number of ratings : 222. |
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| Blind spot - |
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 Find your blind spot ! Close you left eye and look to the + with you right eye. Then increase or decrease distance to the screen until the - disappears ! The blind spot is where the optical nerves enter the eye.
Number of ratings : 193. |
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| Mystic wheel - Nicholas Wade |
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 When you keep looking at the image, it seems to be moving before your eyes. That's because the lens of you eye is not perfectly round. You can't see all of the image sharp, and your eye is constantly making small movements. When you follow the outer rim, you will see that it is impossible.
Number of ratings : 182. |
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| Ouchi Illusion - Hajime Ouchi |
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 This one is really great, try it : look just above or below the circle, keep looking forward and move your head to the left and the right. It's like the background in the circle is moving !
Number of ratings : 179. |
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:: 1977 |
| Mach's book - |
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 Is this book facing towards you or away from you ?
Number of ratings : 178. |
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| Are you color blind ? - |
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 If picture A looks like number 3, and picture B looks like number 73, you're ok. If picture A looks like number 5 and picture B looks like nothing at all, you may have a deficiency in you color vision !
Number of ratings : 169. |
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| Moving Cirle - |
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 Just looking at this circle almost hurts the eyes ; when you keep looking at the black center, it appears to be growing. Keep staring at it and everything you look at seems to be moving . . .
Number of ratings : 136. |
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| Schröder stairs - |
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 Is the glass sphere on the foreground or the background ?
Number of ratings : 121. |
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| Blaze 4 - Bridget Riley |
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Number of ratings : 121. |
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:: 1964 ::  Poster |
| The Necker Cube - |
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 Where is the green side ? On the front of the cube or at the back ? Keep looking at the cube and you'll find that it switches a few times. First described by professor L. Necker who noticed this while studying crystals.
Number of ratings : 106. |
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:: 1832 |
| Kanisza figure - Gaetano Kanisza |
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 This is a closure illusion. There seems to be a triangle that covers colored circles with its corners. Only, there is no triangle. It's created by your visual system. The effect is called subjective or illusory contours.
Number of ratings : 101. |
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| Ambiguous Cube - |
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 Are you looking into a tiled room, or at a cube ?
Number of ratings : 99. |
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| Hering illusion - |
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 Both horizontal lines are straight and parallel. They seem to be bent because of the lines in the background.
Number of ratings : 94. |
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| Movement in Squares, Movement in Squares - Bridget Riley |
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 A well-known example of Op-art.
Number of ratings : 83. |
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:: 1961 :: Poster |
| Loss - Bridget Riley |
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Number of ratings : 79. |
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:: 1964 |
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