POSTS / “Between-Legs Effect” Mystery

The horizontal-vertical illusion is a phenomenon in which the vertical line appears longer when a horizontal line and a vertical line of the same length are drawn.

for example, the vertical bar in the following image look 1.4 times longer than the horizontal one, though they are of the same length.

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however, Higashiyama from Japan found that when lying on one’s side, the horizontal-vertical vertical illusion does not occur.

then he won a Ig Nobel Prize. 😄

from Ig Nobel Prize Winner Higashiyama Atsuki and the “Between-Legs Effect” Mystery.