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A problem humans are experiencing in their everyday life is to have too many things placed in a limited space: books on shelves, addresses in agenda, windows on a computer screen, data to display in a Personal Digital Assistant (PDA). The information explosion phenomena of last years leads to the existence of more data than what can easily be displayed at once. Too much data, too little display area is a common problem in Information Visualization (Spence, 2001).

There are several techniques proposed to solve this problem, some of which are (Spence, 2001):