In a piece of animation, there are hundreds of frames.

Typically, they are organized on an exposure sheet. The sheet describes, for each piece of artwork used, on which frame the art is first used, what happens to it (on a frame by frame basis) while it is used, and on which frame it disappears. Also noted on the sheet, for each frame, are any changes in the animation system (animation table, camera, lights, etc.). Exposure sheets on the PictureMaker are created using the SEQ program, and are organized somewhat differently than traditional sheets, in order to best use the computer. Each level (or layer, or plane) can be one of three types: Image (a file of pixel values), object (a 3D database and animation path), and explicit command (a PictureMaker command mode command). Each level specifies a beginning from and duration (ending frame), and the computer keeps track of all levels with respect to their overlaps in both time and space.