11. A computer implemented method for generating groups of cluster spines for display, comprising: generating one or more concepts for each cluster in a set of clusters; forming spines from at least a portion of the clusters based on the concepts; placing at least one spine unique from all the other spines; generating one or more spine groups by positioning at least one unplaced spine in relation to one of the placed unique spines; and displaying the spine groups.
13. A method according to claim 11 , wherein the spines are formed based on a best fit, comprising: comparing one of the clusters to each spine and determining a fit between the cluster and the spines; assigning the cluster to the spine with the best fit.