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Café wall illusion

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Cafewall

The café wall illusion

The café wall illusion is an optical illusion, first described by Doctor Richard Gregory. He observed this curious effect in the tiles of the wall of a café at the bottom of St Michael's Hill, Bristol.

This optical illusion makes the parallel straight horizontal lines appear to be bent.

To construct the illusion, alternating light and dark "bricks" are laid in staggered rows. It is essential for the illusion that each "brick" is surrounded by a layer of "mortar" (the grey in the image). This should ideally be of a colour in between the dark and light colour of the "bricks".

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fr:Illusion du mur du café
he: אשליית הקירות העקומים
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