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Shapes
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The café wall effect
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| This phenomenon was first noted on the wall of a café -
hence the name. What is happening? |
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The Hermann grid
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| A grid with black, flickering spots which suddenly
disappear. There is a reason for everything. |
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Fraser’s spiral
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| The spiral shown really only consists of segments of a
circle. How is the false impression given? |
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Escher’s stairs
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| Why do the stairs go continuously up or down? A unique
optical illusion. |
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Necker cube
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| The cube has been drawn so that the viewer has two
perception "options". |
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