In the Müller-Lyer visual illusion,a line with two open-angle ends appears longer than a line with two closed-angle arrowhead ends,even though the lines are in fact the same length.This illusion is more common in cultures where:

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The Müller-Lyer illusion is thought to occur because the brain is more accustomed to processing right angles than acute or obtuse angles. In cultures where carpentry is prominent, individuals are more likely to be exposed to right angles on a regular basis, which may make them more susceptible to the illusion.

In the Müller-Lyer Visual Illusion,a Line with Two Open-Angle Ends