The Ponzo Illusion is an optical illusion that was first described by the Italian psychologist Mario Ponzo in 1913. It is an example of an ambiguous figure that can be interpreted in two different ways. The illusion is created by two parallel lines that cross a series of converging lines. Depending
From Wikipedia
The Ponzo illusion is a geometrical-optical illusion that takes its name from the Italian psychologist Mario Ponzo (1882–1960).