Optical illusions / Double meaning

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Is it a man playing a sax
or only a woman's face ?

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Is it a young woman or an old one ?

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Is it an Indian or an Eskimo ?

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Is it a duck or a rabbit ?

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Is it an old man or a kissing couple ?

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A man's face or: a woman with her baby, an old man and a dog on the road?
At the background you can see other faces.
(You can find 9 faces in this picture)

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Is it a girl looking at the mirror or a skull ?

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Is it a seal, a white beer head or just a hole in the ice ?

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There are two faces hiding in this vase ...

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There are three faces hiding in these flowers:
Napoleon, his wife and his son