The Orbison illusion is an optical illusion that was first described by the
psychologist William Orbison in 1939. The bounding rectangle and inner square
both appear distorted in the presence of the radiating lines. The backgrounds
gives us the impression there is some sort of perspective. As a result, our
brain sees the shape distorted. This is a variant of the Hering illusion and
reminds of Wundt illusion.