There is no Doubt that 'color' is a real factor here and morning/afternoon and evening colors compete for top honors. Might be correct to say, "you had to be there" to be accurate, but we LOVED IT!
Took a tour from Goulding's complex but some of the local indians also have a service. Our guide, Paul, was a hefty gent with a good sense of humor and good driving skills. He got us around the floor of the Valley for 3.5 hours and ended up with the setting sun right where the camera said "YES! That's IT!"