Dense branching pattern formed when air is injected into a viscous fluid. Pattern shapes at long times can be selected by controlling the injection rate.

From the article:

Control of Viscous Fingering Patterns in a Radial Hele-Shaw Cell
Shuwang Li, John S. Lowengrub, Jake Fontana, and Peter Palffy-Muhoray
Phys. Rev. Lett. 102, 174501 (2009)

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