What's wrong in this famous portrait of Goethe? Click to enlarge and study. Answer at page bottom.
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Enlarge the picture and stare at the four dots in the middle for about 40 seconds. Then look at a blank surface like a wall. Blink your eyes and you will see a figure appear. Who is it? Answer at page bottom.
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Two different animals are revealed in this illusion. What are they? Answer at page bottom.
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Enlarge and study this picture. Is the image a graphic animation, or does it only appear to be so? Answer at page bottom.
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Which two figures alternately appear in this illusion? Answer at page bottom.
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What is the technical name for this impossible object? Answer at page bottom.
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