I don't know what u mean by primary purpose light colors but if you just asking for primary colors these are the only ones.
The study of the fundamental nature of knowledge, reality, and existence, especially when considered as an academic discipline.
The name of the artist and work is B. Robert Smithson, Spiral Jetty, 1970.
It represents an earthwork sculpture made of mud, salt crystals, and basalt rocks, and in the shape of a spiral. It is 460 meters long, and 4.6 meters wide, but also counterclockwise. It is located on the northeastern shore of the Great Salt Lake in Utah.