1. A system for generating groups of cluster spines for display, comprising: a theme generator to generate one or more concepts for each cluster in a set of clusters; a spine generator to form spines from at least a portion of the clusters based on the concepts; a spine placement module to place at least one spine unique from all the other spines; a spine group generator to generate one or more spine groups by positioning at least one unplaced spine in relation to one of the placed unique spines; and a display to display the spine groups.