Horizon Line definition

The horizon line is a line drawn across a picture.  It is essential for a picture to have a horizon line if a person wishes to communicate from what perspective a person is observing the picture (from above an object, below an object…etc).   It is not necessary to include the horizon line in the picture.  However, it is important to include a ‘virtual’ horizon line in order to make a picture follow correct perspective.  The horizon line is always one’s eye level.  If one draws a line perpendicular to the ground outwardly from one’s eye level, this is what is considered the horizon line.