A Voronoi diagram is created from a set of points by dividing the plane into regions, where each region consists of the area closest to one of the points. Ken Shirriff published a paper about voronoi fractals ten years ago. Frederik Van Houtte from Belgium created a nice applet with the processing language to generate online voronoi fractals.

Click the applet to generate a new fractal.

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A description of the project and the source code are published on Frederiks weblog under a  a Creative Commons license.