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Maze
Grain Maze
Credits: Complex
This is aMAZING physics!
Grain maze. A maze-like pattern emerges when a mixture of grains and fluid confined between two glass plates is slowly drained. Fingers of air penetrate the system, leaving behind a complex, branching structure of compacted grains. The pattern forming instability is a result of a finely balanced interaction between capillary forces and friction.
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