This document discusses planes and how they organize space in visual art. It defines a plane as a two-dimensional surface with length and width that has a position and direction in space. Planes can be geometric or organic. The surface an artist draws on is called a support. Planes organize space through composition, balance, and compensation. The rule of balance states important elements should be centered, while less important ones are evenly placed left or right. The rule of compensation means larger elements should be closer to the center to balance the composition. The document provides examples of abstract mural sketches applying these concepts and defines key terms like sketch, abstract, and collage.