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 in 1997 with the BBC blocks, a logo designed to work across media. From 1958, for this television network, there are five different logos. The first logo of network is used from 1958 to 1963, the second logo is used from 1963 to 1971, the third logo is used from 1971 to 1992, the fourth logo is used from 1988 to 1998, and the fifth and current logo is used from 1997. Before the BBC introduced its logo itself, in the form of the slanted boxes, the BBC used a variety of different symbols with which to represent itself. In