1. A method of authoring a computer-generated treemap display, comprising: receiving, from a graphical user interface, a treemap configuration definition that defines the format of a treemap display page, the treemap configuration definition comprising at least one color parameter and at least one cell size parameter; receiving, from the graphical user interface, a data definition that defines a set of data to be represented by a treemap on the treemap display page; and generating treemap display data operable to initiate display of the treemap display page from the treemap configuration definition and the data definition, the treemap display page comprising a treemap representation of the set of data.