S.I.M. - Purple Rainbow

Is a rainbow still a rainbow if the rainbow's colored purple; for the color purple's in a rainbow but a rainbow's not just purple. It'd be quite a pretty sight though, in the sky gleaming bright; a purple rainbow running 'cross like a traveler's light. Yet..., no I wouldn't like a purple rainbow running through the night, for it's the rainbow's diversity that brings glee to me

S.I.M.

http://www.poemhunter.com/poem/purple-rainbow/