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Simulations of reality are more and more developed for technical and scientific objectives and are based on models representing the different relevant phenomena. These models import data from databases and display their results with visible text or graphic representations. In simulations, reality is represented at three different levels: computer representations of previous measures stored into optimized databases, visible representations of model results and mental representations of scientists and observers. The importance of realistic visible representations is discussed with a landscape vegetation model for semi-arid ecosystems. Complete simulations of reality require the development of new representation techniques involving touch, smell, and taste and not only sight and hearing.