What metaphors are used in A Spell for Chameleon by Piers Anthony?

Isle of Illusion is a metaphor for unreality. The Isle of Illusion is located off the eastern shore of Xanth and is the beautiful, illusionary home of the Sorceress Iris. The illusions, which make the Isle so attractive, crumble easily when Bink uses his mental strength to refuse her offers of power. It is here that Bink first learns the power of his intellect, and discovers that the strength of his morals is a valuable resource against evil.