This article argues in favor of representing the spatial
distribution of information within and between documents, by surveying a broad
variety of potential applications, including the entire document lifecycle,
multiple sensory modalities, and a large spectrum of tasks and users. The
theoretical explanations of this richness are a further facet of the article,
and can be summarized as follows: (1) insights emerge from focusing on
information structure, rather than information meaning; (2) spatializing
information creates new information; (3) simplification increases the
polyvalence of representation models; (4) introducing mystery in communication
channels motivates discovery and diversifies insights; (5) approaching
information design as a Gesamtkunstwerk multiplies the
applications; (6) information is a manifestation of a link between structures
and the actions these enable, while information design is the art and science of
creating such links. The argument is developed around the concrete example of a
document structure visualization, the Document Towers, which uses the metaphor
of architectural models to represent documents.