Lichtenberg figures are a sort of concrete, 3D model of a fractal tree. They are formed by hitting a block of clear acrylic with about 5 million volts of electricity. As the electrons blast their way through the material they leave a trail. And as they move, they try to avoid each other, forming smaller and finer, non-overlapping paths. The branching is said to go down to a molecular level.
The above photo is from http://www.teslamania.com/ where you can buy Lichtenberg figures and see how they are made. Here is a close-up photo of an approximate one square inch of a Lichtenberg figure:
Click to see an even higher res version.
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