1. An information system comprising: a graphical user interface; one or more graphical structures displayed in the graphical user interface, each graphical structure defined by two or more spatial dimensions, the intersection of which defines a segment, wherein each segment represents a collection of information associated with the intersection of dimensions; and one or more controls displayed in the graphical user interface, the one or more controls being responsive to user input and configured for graphically manipulating selected segments of the one or more graphical structures.