Shadow projection — where it appears
Named by 2 essays across 2 fields — each of them below, with the objects they name alongside it.
An anamorph at true size, on paper
An anamorph is the shadow of the intended picture, cast from the reader’s own eye. Every claim on this site is quoted against an assumed display width because the site cannot know how wide its figures really are; this one is not, because it ships a sheet in millimetres and states where to put an eye.
Three constructions, one map
A shadow cast on a floor, an anamorph painted on one, and a reflection in a mirror were built in three different fields of this site, three phases apart, each with its own derivation and its own figure. Decomposed into their fixed points and lines, three of them are the same kind of map — a central collineation with a line of fixed points — and the fourth, a rectification, is not. That difference separates changing where a picture is seen from, from changing one picture into another.
Named alongside it
The objects these essays reach for when they reach for this one.
AnamorphosisHomographyCentral collineationCharacteristic ratioCollineationDemonstrationDesarguesElationFixed pointMirror planePlanar homologyPrintable figure