Sources
Where every fact on illusions.im comes from.
- Encyclopaedia Britannica: Op art, checked 31 Oct 2026. Used for 3 facts.
- Encyclopaedia Britannica: Sir Charles Wheatstone, checked 31 Oct 2026. Used for 1 fact.
- Encyclopaedia Britannica: afterimage, checked 31 Oct 2026. Used for 2 facts.
- Encyclopaedia Britannica: camera obscura, checked 31 Oct 2026. Used for 3 facts.
- Encyclopaedia Britannica: illusion, checked 31 Oct 2026. Used for 5 facts.
- Encyclopaedia Britannica: pareidolia, checked 31 Oct 2026. Used for 1 fact.
- Encyclopaedia Britannica: stereoscope, checked 31 Oct 2026. Used for 2 facts.
- Encyclopaedia Britannica: zoetrope, checked 31 Oct 2026. Used for 2 facts.
- Exploratorium Science Snacks: Blind Spot, checked 31 Oct 2026. Used for 1 fact.
- Exploratorium Science Snacks: Fading Dot, checked 31 Oct 2026. Used for 1 fact.
- Michael Bach: Benham’s top, checked 31 Oct 2026. Used for 1 fact.
- Michael Bach: Café wall illusion, checked 31 Oct 2026. Used for 2 facts.
- Michael Bach: Checker shadow illusion, checked 31 Oct 2026. Used for 1 fact.
- Michael Bach: Ebbinghaus illusion, checked 31 Oct 2026. Used for 2 facts.
- Michael Bach: Face on Mars, checked 31 Oct 2026. Used for 1 fact.
- Michael Bach: Hermann grid, checked 31 Oct 2026. Used for 1 fact.
- Michael Bach: Hollow face illusion, checked 31 Oct 2026. Used for 1 fact.
- Michael Bach: Impossible objects, checked 31 Oct 2026. Used for 4 facts.
- Michael Bach: Lilac chaser, checked 31 Oct 2026. Used for 1 fact.
- Michael Bach: Moon illusion, checked 31 Oct 2026. Used for 1 fact.
- Michael Bach: Müller-Lyer illusion, checked 31 Oct 2026. Used for 2 facts.
- Michael Bach: Necker cube, checked 31 Oct 2026. Used for 2 facts.
- Michael Bach: Shepard’s tables, checked 31 Oct 2026. Used for 1 fact.
- Michael Bach: Wagon wheel effect, checked 31 Oct 2026. Used for 1 fact.
Each source was checked on the date shown. Michael Bach’s pages describe interactive demonstrations; our drawings are our own.