The Hering Illusion, consisting of two parallel lines over a radial background, leads to a widespread perception that these lines bow outward—despite their true straightness.
Ewald Hering proposed that the illusion arises from the brain's overestimation of intersection angles between lines, with contemporary explanations linking it to lateral inhibition in the visual cortex.
Some researchers challenge Hering’s hypothesis, suggesting the illusion is due to a temporal delay in our visual system, which predicts visual information in the next millisecond.
Variations of the Hering Illusion include the Orbison and Wundt illusions; Hans Kuiper's Three in One plays on perceptions of diagonal lines where all are actually straight.
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