68.7 MB (415.4 KB compressed)
6000 x 4000 pixels
50.8 x 33.8 cm ⏐ 20.0 x 13.3 in (300dpi)
SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Titchener illusion, computer artwork. The two red circles are actually the same size. However, the brain perceives that one is smaller or larger according to the sizes of the surrounding blue circles. This illusion is named after the experimental psychologist Edward Bradford Titchener (1867-1927).
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