This example demonstrates a Voronoi diagram on a torus, where 300 random points create cells that wrap seamlessly across the canvas edges. It shows how the cell structure repeats across a virtual cylinder in both horizontal and vertical dimensions, with the interactive site highlighted in red. The code uses d3.voronoi to compute the diagram, duplicating each site into eight shadow copies to handle the toroidal topology, then filtering links between shadow copies. Rendering is done via Canvas 2D context, with polygons, links, and sites drawn as separate paths.