Spotted by Hugo Münsterberg, a pioneer of psychology in 1890, then analyzed and conceptualized by Professor Richard Gregory in 1979, the effect of the wall of the Bristol café remains a mystery of the cognitive psychology of our brain...
For the effect to be optimal, squares of light then dark color follow each other on a line, on the line below these squares are slightly intercalated, a line separates each horizontal row which gives the illusion that these straight lines are no longer really straight and which converge strangely towards each other.
The Groin had fun in this series of illustrations dedicated to the illusion of the wall of the Bristol café to stick his Groin on it.
