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Café wall illusion

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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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[edit] External links

fr:Illusion du mur du café
he: אשליית הקירות העקומים
Smallwikipedialogo.png This page uses content from the English-language version of Wikipedia. The original article was at Café wall illusion. The list of authors can be seen in the page history. As with Psychology Wiki, the text of Wikipedia is available under the GNU Free Documentation License.