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.
rung 5 · foundations