There are seven levels in which cultures fall, with Stage I languages having only the colors black and white. Languages in Stage VII have eight or more basic color terms. This includes English, which has eleven basic color terms. The authors claim that as languages evolve, they develop color terms in a strict chronological sequence; if a color term was found in a language, then color terms from all previous stages would also be present. The sequence is as follows:
Stage I: Dark-cool and light-warm (this covers a larger set of colors than English "black" and "white".)
Stage II: Red
Stage III: Either green or yellow
Stage IV: Both green and yellow
Stage V: Blue
Stage VI: Brown
Stage VII: Purple, pink, orange or grey
Though the work has achieved widespread influence, it is not without its critics. Barbara Saunders has questioned the methodologies of data collection and the cultural assumptions underpinning the research.
Patent No. 7,625,093 Issued on Dec. 1, Assigned to Seiko Epson for Image Display Device Having A Plurality Of Basic-Color Projection Units (Japanese Inventor)
Dec 02, 2009; ALEXANDRIA, Va., Dec. 5 -- Tomio Sonehara of Shiojiri, Japan has developed an image display device with a plurality of...