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Created page with "== Introduction == The Müller-Lyer illusion is a well-known optical illusion in which two lines of the same length appear to be of different lengths due to the orientation of arrow-like fins at the ends of the lines. This illusion was first described by the German psychologist Franz Carl Müller-Lyer in 1889. The illusion has been extensively studied in the field of psychophysics, a branch of psychology that deals with the relationships between physical stim..."
