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Voronoi tessellation (VT, black) and Delaunay triangulation (DT, red) of a set of points representing cell-centres. The VT divides the plane into polygons such that every point in a polygon is closer to its corresponding cell-centre than any other. The DT partitions the plane into triangles and is the dual graph to the VT. Spring forces act along the lines of the DT. (Online version in colour.)
