Horizon line (eye-level line): The line where the sky and the earth seem to meet. Also—and most importantly—this is the eye level of the viewer or artist.
Vanishing Point: Point on the horizon at which receding parallel lines meet in a perspective drawing. In one-point perspective, this is also the point directly in front of the viewer.
Diagonal vanishing point: an auxiliary vanishing point used to draw receding parallel, diagonal lines and to divide planar surfaces equally. See accompanying illustrations.
Station point: Point of view from which a drawing and measurements for a drawing are made; the place where the artist is sitting or stationed.
Picture plane: Surface of a drawing; the plane onto which images are projected.
Sighting: Technique of using a pencil to “measure” proportions and estimate angles.
Descending Horizon Line drawing: On a piece of paper draw four different
formats and in the first one have the horizon line sit one fourth of the way
down in the format. Keep descending this horizon line down in each following
format until the last one is about 3/4 of the way down. Now draw the five
forms within each format, moving them closer together as the horizon line
descends. This assignment will help you to understand the perspective
dependent on the viewer's position within the 'landscape'.
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