"Van Gogh's work had hitherto been very dark, with scarcely any color, and he was at first bewildered by the rich coloring and the light which he discovered in the impressionist pictures. But when Pissarro explained to him the theory and technique of his own paintings, van Gogh began to experiment and immediately took to the new ideas with great enthusiasm. He completely changed his palette and his execution, even adopting for a while the neo-impressionist dot, although he used it without systematic ."