Orbison illusion
Image:Orbison [illusion.svg|thumb|right|Orbison illusion consisting of a square placed over radial lines.]
The Orbison illusion is an optical illusion first described by American psychologist William Orbison in 1939.
The illusion consists of a two-dimensional figure, such as a circle or square, superimposed over a background of radial lines or concentric circles. The result is an optical illusion in which both the figure and the rectangle which contains it appear distorted; in particular, squares appear slightly bulged, circles appear elliptical, and the containing rectangle appears tilted.