The visible colour spectrum in light ranges in frequency from approximately 390 to 700 nanometres. Since 2009, Olafur Eliasson has been engaged in a project that he hopes will eventually lead to a new colour theory based on the prismatic colours. He began these experiments by working with a colour chemist to mix in paint an exact colour for each nanometre of light in the visible spectrum. Since the initial experiments, Eliasson has used this palette to make a number of different paintings, known collectively as the Colour experiment paintings. Each painting is different and individual, but all are attempts at investigating what Eliasson hopes will evolve into a new colour theory.