International Colour Day

March 21 was proclaimed as the International Colour Day by the members of the International Colour Association, which composed of national associations and members representing more than 30 countries. March 21 was chosen because it is the equinox (which occurs twice a year). During the equinox, the night and day are approximately equally long, symbolically relating to the complementary nature of light and darkness, light and shadow, expressed in all human cultures.