A small drawing, showing which colors light a scene from various angles. Sometimes required on educational light plots to make them easier to grade for the professor. Often each scene will have its own Color Key.
See also this thread: http://www.controlbooth.com/forums/lighting/8035-angle-color-visualization.html.
See also this thread: http://www.controlbooth.com/forums/lighting/8035-angle-color-visualization.html.