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SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Wundt illusion. This illusion was created by the psychologist Willhelm Wundt in the 19th century. It is the exact opposite of the Hering illusion. It exploits the brain's understanding of perspective to fool it into thinking that the two horizontal red lines bow inwards. In fact they are straight and parallel. This is achieved due to the presence of the grey lines radiating from 2 points. They give the appearance of depth, with the middle of the image appearing closer than the top. The brain compensates for this, and the illusion is created.
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