Perspective projection is a method of drawing that involves representing the three-dimensional aspects of an object on a two-dimensional surface. There are several synonyms for the term perspective projection that can be used interchangeably. One synonym for perspective projection is foreshortening. Foreshortening is the technique of showing an object as closer or farther away than it really is by decreasing or increasing its apparent size. Another synonym is vanishing point perspective, which refers to the use of a single point on the horizon line to create an illusion of depth and space. Additional synonyms for perspective projection include atmospheric perspective and linear perspective. Atmospheric perspective describes how objects appear to have less contrast and detail the farther away they are, due to the effect of the atmosphere on light. Linear perspective involves using lines and angles to create depth and the illusion of space.