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Openclipart
Optical Illusion (3)
2008-02-23T15:50:09
Jegorow, F.G. (1957). Militaerpsychologie. Berlin: Verlag des Ministeriums fuer nationale Verteidigung.
https://openclipart.org/detail/14762/optical-illusion-(3)-by-cibo00-14762
cibo00
externalsource
human perception
optical illusion
poles