No one did colour more blatantly and more unexpectedly than Van Gogh. Its blatancy gives his pictures their roaring charm. Colour, he seems to be saying: you haven’t seen colour before, look at this deep blue, this yellow, this black; watch me put them screechingly side by side. Colour for Van Gogh was a kind of noise.
Julian Barnes in the LRB vol 37 no 15, 30 July 2015 p.7