File:Müller-Lyer Illusion - MathWorld version.svg

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English: Müller-Lyer illusion. Optical illusion in which the orientation of arrowheads makes one line segment look longer than another. In the above figure, the line segments on the left and right are of equal length in both cases. MathWorld (source).
Français : Illusion de Müller-Lyer. Illusion d'optique dans laquelle l'orientation des pointes de flèche fait paraître un segment de ligne plus long qu'un autre. Dans la figure ci-dessus, les segments de droite à gauche et à droite sont de longueur égale dans les deux cas. Version MathWorld (source).
Date
Source

MathWorld - Müller-Lyer Illusion

Müller-Lyer, FC (1889). "Optische Urteilstäuschungen". Archiv für Physiologie Suppl.: 263–270.
Author Franz Müller-Lyer
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Public domain This image of simple geometry is ineligible for copyright and therefore in the public domain, because it consists entirely of information that is common property and contains no original authorship.
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Müller-Lyer Illusion - MathWorld version

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