The “Ebbinghaus illusion” or “Titchener circles” 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 large circles while the other is surrounded by small circles. As a result of the juxtaposition of circles, the central circle surrounded by large circles appears smaller than the central circle surrounded by small circles.
It was named after its discoverer, the German psychologist Hermann Ebbinghaus (1850 – 1909). The illusion was popularized in the English-speaking world by Edward B. Titchener in a 1901 textbook of experimental psychology.
This t-shirt is everything you’ve dreamed of and more. It feels soft and lightweight, with the right amount of stretch. It’s comfortable and flattering for both men and women.