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
Logo of the BBC class and a group of swimmers. These idents have been criticised for lacking in creativity. The current central logo of the BBC is still the BBC Blocks. It is the longest-used logo by the BBC, and as of 4 October 2017, it has been in use for 20 years. Logo of the BBC The BBC logo has been a brand identity for the corporation and its work since the 1950s in a variety of designs. Until the introduction of a logo in 1958, the corporation had relied on its coat of arms for official documentation and correspondence, although this crest