One of the reasons that blue may have come to be associated with futuristic effects in physical devices is that blue LEDs hadn't been possible until relatively

One of the reasons that blue may have come to be associated with futuristic effects in physical devices is that blue LEDs hadn't been possible until relatively recently: It wasn't until the early 1990s that Professors Isamu Akasaki, Hiroshi Amano and Shuji Nakamura invented them (and won the 2014 Nobel Prize in Physics).