optical paradox
   A term introduced in or shortly before 1892 by the German philosopher and psychologist Franz Clemens Honoratus Hermann Brentano (18381917) to denote an "optical illusion such as the " Müller-Lyer illusion.
   References
   Brentano, F. (1892). Uber ein optisches Paradoxon. Zeitschrift fur Psychologie und Physiologie der Sinnesorgane, 3, 349-358.

Dictionary of Hallucinations. . 2010.

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