Illusions and Impossible Figures

In Wolfram MathWorld we find a survey with many references to optical illusions and impossible figures.

clipped from mathworld.wolfram.com Illusion clipped from www.ritsumei.ac.jp clipped from mathworld.wolfram.com SEE ALSO: Benham's Wheel, Black Dot Illusion, Bullseye Illusion, Café Wall Illusion, Freemish Crate, Goblet Illusion, Hermann Grid Illusion, Hermann-Hering Illusion, Hyzer's Illusion, Impossible Figure, Irradiation Illusion, Kanizsa Triangle, Müller-Lyer Illusion, Necker Cube, Orbison's Illusion, Parallelogram Illusion, Penrose Stairway, Poggendorff Illusion, Ponzo's Illusion, Rabbit-Duck Illusion, Tribar, Tribox, Vertical-Horizontal Illusion, Young Girl-Old Woman Illusion, Zöllner's Illusion. [Pages Linking Here] clipped from mathworld.wolfram.com Freemish Crate The Freemish crate, also called Escher's cube (Elber) or Hyzer's illusion (Pappas 1989, p. 13), is an impossible figure box that can be drawn but not built clipped from mathworld.wolfram.com SEE ALSO: Ambihelical Hexnut, Freemish Crate, Home Plate, Illusion, Impossible Fork, Impossible Joinery, Impossible Torus, Klein Bottle, Necker Cube, Penrose Stairway, Penrose Triangle, Tribar, Tribox. [Pages Linking Here]