A playful variation on this example about collision detection, aiming to create a sort of weighted Voronoi tessellation. The center of each circle is used as an input vertex for d3.geom.voronoi (see the docs).
Some cells are indeed bigger than other ones, but the resulting area is in general not proportional to the intended value.
The non-overlapping circles used to generate the tessellation can be seen as translucent bubbles. You can also adjust the padding between them by using the slider.