TIL that the only reason Indigo exists on the ROY G BIV spectrum is that Isaac Newton wanted 7 colors to correspond to the notes on a major scale

https://en.wikipedia.org/wiki/Indigo



Submitted March 31, 2015 at 08:15PM by adamvideo1 http://www.reddit.com/r/todayilearned/comments/30xi96/til_that_the_only_reason_indigo_exists_on_the_roy/