In the October 1892 issue of Fliegende Blätter, a German humor magazine, there appeared an image depicting an optical illusion. The image was a sketch of a rabbit’s head, or was it a duck’s head? Both images seemed to switch back and forth from being a duck then being a rabbit. Half a century later, the image appeared again in Ludwig Wittgenstein’s 1953 book Philosophical Investigations, where the famed philosopher used the example to illustrate how certain figures could be interpreted in more than one ways. Over the next seventy years, the duck-rabbit illusion would appear countless number of times in books, magazines and websites.
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Source: amusingplanet.com