“A palette nowadays is absolutely colorful: sky-blue, pink, orange, vermillion, strong yellow, clear green, pure wine red, purple. But by strengthening all colors one again obtains calm and harmony; there happens something similar to Wagner’s music which, even though performed by a great orchestra, is nonetheless intimate.”

—Vincent van Gogh, in a letter to his sister, as quoted in Post-Impressionism from van Gogh to Gauguin by John Rewald, 1958.