Illusions
- Ambihelical Hexnut
- Angle Illusions
- Benham's Wheel
- Blivet
- Bullseye Illusion
- Café Wall Illusion
- Continuous Line Illusion
- Delboeuf Illusion
- Ehrenstein Illusion
- Escher's Cube
- Fraser's Spiral
- Freemish Crate
- Goblet Illusion
- Hering Illusion
- Hermann Grid Illusion
- Hermann-Hering Illusion
- Illusion
- Illusory Contour Figures
- Impossible Box
- Impossible Figure
- Impossible Fork
- Impossible Joinery
- Impossible Torus
- Impossible Triangle
- Impossible Tribar
- Irradiation Illusion
- Jastrow Illusion
- Kanizsa Triangle
- Morellet's Tirets Illusion
- Müller-Lyer Illusion
- Münsterberg Illusion
- Necker Cube
- Optical Illusion
- Orbison's Illusion
- Ouchi Illusion
- Parallelogram Illusion
- Penrose Rectangle
- Penrose Square
- Penrose Stairway
- Penrose Triangle
- Penrose Tribar
- Poggendorff Illusion
- Poiuyt
- Ponzo's Illusion
- Rabbit-Duck Illusion
- Rotating Square Illusion
- Schouten's Staircase
- Schroeder Stairs
- Scintillating Grid Illusion
- Square Illusions
- Square-in-a-Circle Illusion
- Three-Arc Illusion
- Titchener Illusion
- Tri-Bar
- Tribar
- Tribox
- Vertical-Horizontal Illusion
- Wundt Area Illusion
- Wundt Illusion
- Young Girl-Old Woman Illusion
- Zöllner's Illusion