In 1956, British psychiatrist Lionel Penrose and his son, mathematician Roger Penrose, submitted a short article to the British Journal of Psychology titled "Impossible Objects: A Special Type of Visual Illusion".
Under 1956 skrev den brittiske psykiatrikern Lionel Penrose och hans son matematikern Roger Penrose en kort artikel i British Journal of Psychology med titeln "Impossible Objects: A Special Type of Visual Illusion".