The art is from the first authorized paperback edition of The Lord of the Rings, released by Ballantine in 1965. Artist Barbara Remington famously had not read any of Tolkein’s books before completing the project; she had only heard accounts from friends. The end result befuddled and irritated Tolkien, but became hugely popular with his young fans—and most everyone attracted to mind-altering substances.
Remington’s bright canvas came in a poster version as well, seen below. The demarcations separating the individual covers are obvious.
(Poster puzzle images via eBay)