We all know our fair princesses have, by far, the most beautiful manes in all of Equestria...but why have they grown out in such ways? They had been shown to have solid color manes, such as Celestia's pink mane and Luna's blue one, but their manes have changed in many ways. Stars and rainbows, long and flowing...so many changing but no one seems to know why but the wearers of said manes.