1. Detail-objects that are closer appear more detailed than objects that are far away.
2. Overlapping-when one object is positioned in front of another object, part of the object behind it is blocked from view. This is called overlapping.
3. Size-Objects that are closer to the viewer appear larger than objects that are farther off in the distance.
4. Foreground, middle-ground, and background--Objects drawn at the bottom of the picture plane are in the foreground & appear closer. Objects drawn at the top of the page are in the background and appear further away..
