Definition: The horizon line in perspective drawing is a horizontal line across the picture. It is always at eye level - its placement determines where we seem to be looking from - a high place, or from close to the ground. The actual horizon might not be visible, but you need to draw a 'virtual' horizon to construct a picture in perspective.
Horizon Line - What is the Horizon Line?
From Helen South's Drawing/Sketching Glossary, for About.com
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