The illusion illustrated above in which the bounding rectangle and inner square both appear distorted.
Orbison's Illusion
See also
Hering Illusion, Illusion, Müller-Lyer Illusion, Ponzo's Illusion, Vertical-Horizontal Illusion, Wundt IllusionExplore with Wolfram|Alpha
References
Fineman, M. The Nature of Visual Illusion. New York: Dover, p. 153, 1996.Referenced on Wolfram|Alpha
Orbison's IllusionCite this as:
Weisstein, Eric W. "Orbison's Illusion." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/OrbisonsIllusion.html