The use of red and blue, often together, is a recurring and significant part of Twin Peaks. Some of the most notable examples are seen in season 1, episode 6 (“Cooper’s Dream”).

Dr. Jacoby’s glasses, the Icelandic flags and decorations, and Catherine/Ben’s dress sense all use red/blue connotations. The red curtains Jacques Renault’s cabin–symbolising its connection to The Black Lodge–and Jacoby’s blue living room–symbolising one part of how Jacoby “sees things for how they really are”–use the colors seperately.