A metaphor for good information design is a map. Hold any diagram against a map and see how it compares.
Edward TufteThe commonality between science and art is in trying to see profoundly - to develop strategies of seeing and showing.
Edward TufteHere's the general theory: To clarify, add detail. Imagine that. To clarify, add detail. And clutter and overload are not an attribute of information, they are failures of design. If the information is in chaos, don't start throwing out information, instead fix the design.
Edward Tufte