The artist, the scientist and the architect who want to understand their world are fascinated by light. Light is the medium of perception in art and in architecture. Light is also one of the most fascinating aspects of physics. As far as we know, it is the only constant. Indeed time and space warps around the constant speed of light. Examine the perceptual and physical aspects of light and learn how the design profession has used light, the tools with which it studies light, and the design principles and drawing conventions with which the profession manipulates light in buildings.