More than one way to link a cat "The move from document-centered hypertext systems to map-based hypertext systems had some unforeseen but far-reaching implications: relationships between nodes could be expressed in more than one way. Maps showed interconnectedness explicitly, usually in the form of a directed graph. But also node proximity came into play; relationships among different nodes or documents could be indicated simply on the basis of their relative location. The use of these map-based hypertext systems to author new information spaces uncovered an interesting phenomenon. Users avoided the explicit linking mechanisms in favor of the more implicit expression of relationships through spatial proximity and visual attributes . Further analysis showed that the use of these spatial and visual cues to imply relationships applied not only to map-based hypertext systems, but also to traditional hypertext systems and in the physical arrangement of paper and notecards ."
Spatial Hypertext: An Alternative to Navigational and Semantic Links