Lacking Natural Simplicity

Grimbold's Other World, by Nicholas Stuart Gray, copyright 1963; Ace Fantasy/The Berkley Publishing Group; May, 1986. I've been reading this to my daughter at bed-time on-and-off for a while now, probably enjoying it more than she has; it's one of my favorite children's fantasy books. I'm pretty sure I borrowed a version from the library when I was younger.