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http://en.wikipedia.org/wiki/Fractal

Fractal

Figure 1a. The Mandelbrot set illustrates self-similarity. As you zoom in on the image at finer and finer scales, the same pattern re-appears so that it is virtually impossible to know at which level you are looking.
Un article de Wikipédia, l'encyclopédie libre.

Xénisme

http://fr.wikipedia.org/wiki/X%C3%A9nisme