This clipart called "Puddle" from art.com is a paradox because one looks at the ground and also sees the sky due to a reflection in the puddle. This author (Olson) does not know whether Escher drew this from an actual puddle or just made it up from his endless imagination.
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This drawing from art.com is even more bizarre than the two shown above. It is called "relativity". One of the things that Escher like to draw was an endless staircase. It probably amused Escher, and it also amused the rest of the world.
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Here is another Escher from art.com called "Drawing Hands".
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This one is called "Three Worlds".
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This clipart is from Yahoo Reference. Certain chemicals are involved in eyesight. Examples are vitamin A and dopamine, which is found in the retina. Neuromelanin is also found in the retina, but the role of neuromelanin, if any, is not yet clear. It might just represent cellular garbage.
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This clipart from art.com is called "Eye" appropriately. A close look reveals a skull reflected in the pupil.
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This one, also from art.com, is called "High and Low". It looks like a hallucination.
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This one, again from art.com, is called "Waterfall", and shows water endlessly flowing downhill.
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Your eyesight tends to deteriorate with age. I got this cartoon from an e-mail sent to me. Also there are certain psychiatric drugs which have adverse side effects.
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Shown here is the brilliant German physiological psychologist named Wilhelm Wundt. Wundt, from Heidelberg, worked in both the 19th and 20th centuries, dying in 1920. Wundt was a prolific writer.
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