[D]reams may be neither colored nor black and white, leaving the colors of most of their objects unspecified, as novels do. Perhaps it takes time and energy to fill in all the colors in a richly detailed scene, with the result that most of our dream imagery is fairly sketchy, even if that sketchiness is not recognized by the dreamer.

Eric Schwitzgebel, Changbing Huang, and Yifeng Zhou, in Margaret Talbot, “Nightmare Scenario”