Charles François TIPHAIGNE DE LA ROCHE

CONSTRAINT : to fix the transient image that falls on a mirror.

INVENTION : the idea of fixed-image ϕ (1760). Breaks for the first time the classical unity of time.

WORKS : Giphantie (1760), novel which describes ϕs. The author does not reveal his secret. (E.T.A. HOFFMANN, 1776-1822, was likewise inspired.)