Optical Illusions
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| A rabit or a duck? | Is the book looking towards you or away from you? |
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| A face of a Native American or an Eskimo? | A man playing horn or a woman's sillhouette? |
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| An old woman or a young girl? | Two faces or just one? |
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| Woman in front of a mirror or a skull? | |
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| How many people are in this painting? | |
