What is "scenography"

Scenography \Sce*nog"ra*phy\, n. [L. scaenographia, Gr. ?; ? scene, stage + gra`fein to write: cf. F. sc['e]nographie.] The art or act of representing a body on a perspective plane; also, a representation or description of a body, in all its dimensions, as it appears to the eye.
--Greenhill.

n. 1 The design of theatrical sets. 2 The art or act of representing a body on a perspective plane. 3 A representation or description of a body, in all its dimensions, as it appears to the eye.

Scenography relates to the study and practice of performance design.