Cafe Terrace at Night by Vincent Van Gogh, 1888

Van Gogh wrote about the Cafe Terrace at Night painting in a letter to his sister, saying “Here you have a night painting without black, with nothing but beautiful blue and violet and green and in this surrounding the illuminated area colors itself sulfur pale yellow and citron green. It amuses me enormously to paint the night right on the spot. Normally, one draws and paints the painting during the daytime after the sketch. But I like to paint the thing immediately.
It is true that in the darkness I can take a blue for a green, a blue lilac for a pink lilac, since it is hard to distinguish the quality of the tone. But it is the only way to get away from our conventional night with poor pale whitish light, while even a simple candle already provides us with the richest of yellows and oranges.”