Optical Illusion Fraser Spiral Illusion Op Art Circle, PNG, 772x772px, Watercolor, Cartoon, Flower, Frame, Heart Download
Fraser's spiral
An instance of the Fraser spiral illusion: Concentric circles appear to be spirals. | Kreisel
Akiyoshi Kitaoka on Twitter: "Concentriccaly aligned oblique line segments appear to form spirals. (Fraser illusion or the spiral illusion of the Fraser illusion) https://t.co/yoZ2pTdijp" / Twitter