The diagram can represent at a glance what a verbal description can only present in a sequence of statements. It is the ideal mode for describing relations between things.
Keith Albarn and Jenny Mial Smith, ‘Diagram: The instrument of Thought’
Although all design is based on information, working with statistical information presents special challenges. For one thing, many people find statistics eminently boring. They resent the idea that things, attitudes, points of view, and choices can be reduced to numbers. They view numbers as cold, cerebral, resisting the poetic, and resisting depth of experience. Yet there is more to numerical relationships than this. They are the basis of many religious mysteries and are often assigned emotional qualities. Numerical relationships underlie music. When rightly conveyed, statistical information places data in a context that truly enlightens.
Kenneth J Hiebert, ‘Graphic Design Sources’