Definition of perspective plane in US English:

perspective plane

noun

  • A plane, usually perpendicular to the horizon, which in terms of the internal perspective of a drawing is imagined as the plane nearest to the observer, corresponding to the surface on which the image is depicted, and intersected by notional straight lines passing from the object to the eye, which determine the points of the drawing; also called plane of delineation, plane of the picture.

Origin

Late 18th century; earliest use found in Joseph Priestley (1733–1804), theologian and natural philosopher.