Gabe Duquette, writing at Liposuction, divides artistic fit into two categories: chords and maps.

Chords are elements combined in a way that is appealing, but not because the combination describes reality. Chords exploit the many evolved sweet spots of the senses. They can be comprised of “real” things but prioritize creation of an experience over transmission of knowledge. Chords can be consonant or dissonant — the sum of their parts can elicit pleasure or irritation, or even revulsion. Chocolate and peanut butter fit better than chocolate and ketchup.More