In the café wall illusion, the horizontal parallel lines between rows formed by alternating and staggered black and white tiles appear to be slanted.
It is named so as it was noticed in the wall of a café shop.
Richard Langton Gregory (1923–2010), a British psychologist from the United Kingdom discovered the café wall illusion on the wall of a café in St. Michael Hill, Bristol, the United Kingdom in the year 1973.
According to Gregory, the illusion was first noticed by a member of his lab named Steve Simpson at the facade of a café shop in Bristol.
