What term refers to the base line upon which the front plane of a one-point perspective drawing is viewed?

Question

Quizplus · Accepted Answer

The ground line is the line on which the objects in the drawing rest and it is the baseline from which the perspective lines in one-point perspective emanate. The horizon is the line that separates the sky and the ground, but it is not necessarily the same as the ground line in a drawing. The picture plane refers to the actual surface on which the drawing is made, while the line of vision is the imaginary line between the viewer's eye and the object being viewed.

What Term Refers to the Base Line Upon Which the Front