I'd be interested seeing someone (not fit enough in this topics to do it myself) applying color psychology and mapping it to the years / events / industry.
Could explain the shift from warmer colors to more technical ones (just speculating)
Looks like "Peak Oil" back in 1977 made people feel blue or resulted in different chemicals being used in films. The blue band is much wider for that year all of a sudden.
Could explain the shift from warmer colors to more technical ones (just speculating)