“Of colours it is good to behold green, red, yellow, and white, and by all means to have light enough, with windows in the day, wax candles in the night, neat chambers, good fires in winter, merry companions; for though melancholy persons love to be dark and alone, yet darkness is a great increaser of the humour.”

—Robert Burton, from The Anatomy of Melancholy, first published in 1621; reprinted in 2001.