colorisrelative.com original 

Interactive digital webpage originally uploaded in 2008.

40 solid hexadecimal colors arranged in order of color relationship. Vistitors to colorisrelative.com change the color of the background screen by moving the mouse over a color swatch. This original page seeded a series of similar interactive color pages illustrating how color is relative, known in history of color terms as simultaneous contrast.

Visitors in 2008, via stumbleupon: