The artist Alphonse Mucha associated blue with the past: "Black is the colour of bondage, blue is the past, yellow the joyous present, orange the glorious future."

Blue of course is a cold color. Perhaps one of the less eccentric colors, and ubiquitous as the author mentions. So in line with the disappearance of color from modern design, it is one of the few remaining colors in our vision of the future.