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Art Optics David Hockney's theories
Causes of Color - WebExhibits.org
Color Cell Game about popular color combinations
Colour: Design & Creativity Journal
Color FAQ Charles A. Poynton
Color Schemes For websites, interior design, etc.
Color Theory Jim Scruggs
Color Theory Robert Mayer
Color Theory Tutorial Uses pigment color wheel
Colour Order Systems in Art and Science
DOFMaster - Depth-of-Field Calculator Software and articles
Hyper Physics - Light and Vision Georgia State University
Interactive Color Wheel Rich Franzen
Light & Optics Readings - Patterns in Nature
Lightness Perception and Lightness Illusions
Munsell Color Science Laboratory RIT
39 Optical Illusions & Visual Phenomena
Optics - Paul van Walree Depth-of-field, flare, etc.
Vision and Color Dale Purves