Balcony

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The fifth day of the creation

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Handbill of Hereford, April 1795, announcing The powers of imagination; or, The senses deceived

Handbill of Rackstrow's Museum announcing Clark's optical exhibition of natural magic

Knots

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Circle limit IV (heaven and hell)

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Sphere spirals

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Self-portrait in spherical mirror

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Gravity

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Palm

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Spirals

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Three intersecting planes

M. C. Escher