Digital information objects in a digital information space are linked through the use of an overlay. A dynamic association between an accessed digital information object and each concept node in the overlay is established if the accessed digital information object and the overlay include at least one common concept. Links to other digital information objects are displayed if those objects are represented by information nodes within the overlay linked to a concept node expressing a common concept. At least a portion of the overlay may be exported for incorporation into other overlays or for various information processing functions.