Aesthetics, Criticism & Theory

Aesthetics Online: Website of the American Society for Aesthetics.

Electronic Swatchbook. From the Powerhouse Museum. Thousands of fabric swatches to search, including by color.

Goethe's Theory of Colors. Full text of 1840 available on the Internet Archive.

Plenty of Colour. "Inspiration devoted to colour." Great site with gorgeous photos of color in all its manifestations.