Deutsch: Mondtäuschung: Prinzip der Vergleichsobjekte. Die beiden orangen Kreise in der Mitte sind gleich groß.
English: Optical illusion: The two orange circles are the same size.
Español: Ilusión óptica: Los dos círculos anaranjados son del mismo tamaño.
Français : Illusion d'optique: Les deux cercles oranges sont de la même taille.
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1 June 2006 (original upload date)
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