I started thinking about it. To me, Prismatic Spray is one of those iconic D&D spells, but I don't think I've seen an illustration of it before. I also don't think I've had a character cast it since 1st or 2nd edition, partly because I haven't played as much, partly because I don't play a ton of wizards, and partly because it's a pretty high level spell. Can a 7th or 8th level spell be "iconic"? I'm not sure, but if it can be this is definitely one of them - hey, it's "death by rainbow". I also don't know the origin, or at least I don't remember coming across it, but I suspect it's from one of the Jack Vance dying earth novels.
Anyway, it struck me and I thought I would share.