#visual illusion
- To anamorfize — To intentionally and controllably distort an image, drawing, or object using a special optical system or rigorous geometric calculations, such that it appears distorted or unrecognizable from a normal angle, but becomes perfectly clear, proportional, and intelligible when viewed from a specific fixed vantage point or through a curved mirror (cylindrical or conical).
- Apparition — An archaic, regional, or non-standard form for the act of appearing or the state of that which appears; an appearance, phantom, fleeting vision, or deceptive illusion. In certain old dialects, it was used in isolation to describe an optical illusion or the sudden manifestation of a spiritual element in earthly space.