Optical illusion
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 An optical illusion. The two circles seem to move when the head is moving forwards and backwards |
 The grey bar is the same shade throughout |
 Adding a circle (bottom) destroys the illusion of a bright central disk. |
 Examples of multistable perception |
 Ames room - english legend |
 Ames room - german legend |
 The Scintillating grid illusion. Black spots seem to appear and disappear very fast at the intersections |
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 Some circles, some lines, but no white triangle. |
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 they are parallel lines |
 the diagonal lines are parallel |
 the blue lines are the same length |
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 An optical illusion. Both circles are the same shade of yellow as are both squares containing them the same shade of gray. |
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 The face looks like it is convex... |
 ...but it is actually concave! |
 Is it a duck, or a rabbit? |
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 same size |
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