Color triangle Color triangle A colour triangle is an arrangement of colours within a triangle, based on the additive combination of three primary colors at its corners. An additive colour space defined by three primary colors has a chromaticity gamut that is a color triangle, when the amounts of the primaries are constrained to be nonnegative. Before the theory of additive color was proposed by Thomas Young and further developed by James Clerk Maxwell and Hermann von Helmholtz, triangles were also used to organize colors, for example around a system of red, yellow, and blue primary colors. After the development of the
Duquesne Brewery Clock the clock when it took over in 1999, paying $5,000 a month to show its logo on the face. In 2002, Equitable Gas paid to have their name placed on the clock. In October 2009, AT&T took over the rights to advertise on the clock and has redesigned the face to display the traditional blue and white AT&T logo. As of 2017, the clock is running without advertising. The clock is featured prominently in the 1983 movie "Flashdance". Duquesne Brewery Clock Located on the Duquesne Brewing Company building in Pittsburgh, Pennsylvania, the Duquesne Brewery Clock was the largest single-face clock