The colour-system illustrated can be traced back mainly to Günter Wyszecki, who presented a so-called cuboctohedron based on the experience that each colour-system constructed on the basis of «perceived equidistance» can be replaced by a regular
Date: This colour-system was commissioned by the Optical Society of America (OSA) and has been in existence since 1960.
Country of origin: Optical Society of America, USA
Basic colours: Yellow, blue, green and red
Application: Colour differences can be analysed: science, design, art.
Bibliography: G. Wyszecki, «Farbsysteme», Göttingen 1960.