Information Storage and Retrieval

An information retrieval system in which a set of distinct information items map to respective nodes in an array of nodes by mutual similarity of the information items, so that similar information items map to nodes at similar positions in the array of nodes; the system comprising: a user control for defining a search criterion for selecting information items; a detector for detecting those positions within the array of nodes corresponding to the selected information items; a graphical user interface for displaying a two-dimensional display array of display points representing those positions within the array of nodes corresponding to the selected information items; and a processor responsive to the selected information items, for providing a representation which is generally representative of the information content of the selected information items.