1. An electronic interface permitting a user to explore at least a portion of a collection of data, said collection consisting of at least a plurality of nodes and a plurality of directional references forming interrelations between said nodes, the interface comprising: at least one display region which visualizes at least a portion of said collection by providing at least two arrangement modes capable of visualizing at least two levels of said interrelations, each of said arrangement modes visualizing interrelations of a particular direction of said references.