Everything about Caf Wall Illusion totally explained
The
café wall illusion is an
optical illusion, first described by Doctor
Richard Gregory and Priscilla Heard. 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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