Stare at the dot in the center of the circle and then move your head closer to it. Neat!
The tabletops are identical in shape and size! I haven't believed that either, until I measured it myself.
This is one of classic optical illusions - it is called dancing elephant. Try to count the number of his legs (by Roger Shepard).
Rabbit and duck one more time.
Sigmund Freud and what really on his mind is.
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