Delboeuf illusion

The two black circles are exactly the same size; however, the one on the left may seem larger or smaller.

The Delboeuf illusion is an optical illusion of relative size perception. In the best-known version of the illusion, two circles of identical size have been 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. A 2005 study suggests it is caused by the same visual processes that cause the Ebbinghaus illusion.[1]

Eponym

It was named for the Belgian Philosopher, Mathematician, Experimental Psychologist, Hypnotist and Psychophysicist, Joseph Remi Leopold Delboeuf (1831 1896), who created it sometime in 1887 1888.

References

  1. Roberts B, Harris MG, Yates TA. (2005). "The roles of inducer size and distance in the Ebbinghaus illusion (Titchener circles)". Perception 34 (7): 847–56. doi:10.1068/p5273. PMID 16124270.
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