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This Lichtenberg figure was formed inside a 1.5

This Lichtenberg figure or 'electrical tree' was formed inside a 1.5" cube of polymethyl methacrylate (PMMA) using a 3 MeV electron accelerator.

Bert Hickman, Stoneridge Engineering
Some people think Lichtenberg figures resemble trees. The branching form has fractal characteristics.
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