A new book has been published by “Die Gestalten Verlag” called “Data Flow” (9 Sep 2008). Its content deals with the visualisation of information in graphic design and the first topic of the book features the potential of circles as dataspheres. An older book that has pointed out the potential of wheels as a relevant model for modern interactive design even better is “Reinventing the Wheel” by Jessica Helfand (around 2002). Both books are very recommended sources for any information/interaction designer.
Acknowledging the potential of the wheel