The Illusion
Delboeuf illusion
The Delboeuf illusion is an optical illusion of relative size perception. In the best-known version of the illusion,
two circles of identical size are placed near to each other and one is surrounded by an annulus; the surrounded
circle then appears larger than the non-surrounded circle if the annulus is close, while appearing smaller than
the non-surrounded circle if the annulus is distant. Recent work suggests it is caused by the same visual
processes that cause the Ebbinghaus illusion.
Submenu: Optical Illusions
