"Birds are so much wiser than we! A robin builds a nest for robins. A seagull builds a nest for seagulls. They don't copy each other - or build themselves nests as described in The Birds' Decorating Magazine."

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The experienced physician, mechanic, or physiologist looking at a wound, an engine, a microscopic preparation, "sees" things the novice does not see. If both, experts and laymen, were asked to make exact copies of what they see, their drawings would be quite different.

— Rudolf Arnheim