Illusion of space

Tricks to give the
on a two dimensional surface:
1.  One, two or three point perspective
2.  atmospheric perspective (what seems far away is fuzzy)
3.  size relationships (close objects appear large, far away objects appear small)
4.  overlap
5.  Objects that are far away are darker.  Objects close up are brighter and show intense contrast.
6.  Use of foreground, middle ground and background