cliparts/4/f/1/f/clipart-optical-illusion-5-4f1f.svg image/svg+xml Open Clip Art Library Optical Illusion (5) 2008-02-24T14:01:31 SOURCE: Шеляга, В.В., Глоточкина, А.Д., Платонова, К.К. (1972). Военная психология. Москва. http://openclipart.org/detail/14790/optical-illusion-(5)-by-cibo00-14790 cibo00 clip art clipart externalsource human perception human perception image lines lines media optical illusion optical illusion png public domain svg