Pure light is all colors.
Therefore, it has no hue.
Only when singleness is scattered
Does color appear.
The author writes, "That is why those who follow Tao constantly speak of returning. They unify all areas of their lives and unify all distinctions into a whole. There cannot be diversity within unity. When our consciounes rejoins the true Tao, there is only brightnesss, and all color disppears."
I have seen a double rainbow one time in my life - April 2009. The colors united and eventually they disappeared. It is the way of things. Between the beginning and the end it was a spectacular sight. In Tibetan Buddhism it is believed that such a sight means that someone, like a Rinpoche, has reached enlightenment.