A system and method for arranging clusters in a display by theme. Themes are found within a plurality of clusters. There are one or more concepts per theme and one or more documents per cluster. Those clusters that meet a best fit criteria are assigned by theme into a set of spines with no more than one spine formed per theme. Those spines that are unique from the other spines are retained in the set. The spines that were retained in the set are arranged in a display.