This document defines and describes key elements of three-dimensional design, including: 1) Form, line, plane, volume, mass, space, texture, color, and time as the fundamental formal elements of 3D design. 2) Descriptions of lines, planes, volumes, masses, spaces, textures, colors, and their relationships that define forms in 3D. 3) Additional elements like shape, scale, movement, and transitions that further characterize 3D designed objects.