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Interaction between human and computer is at the heart of modern information visualization and for a single overriding reason: the enormous benefit that can accrue from being able to change one's view of a corpus of data. Usually that corpus is so large that no single all-inclusive view is likely to lead to insight. Those who wish to acquire insight must explore, interactively, subsets of that corpus to find their way towards the view that triggers an 'a ha!' experience.
- [Spence, 2007] Spence, Robert, Information Visualization - Design for Interaction, 2nd Edition, Pearson Education Limited, Essex, UK, 2007, p. 136.