An algorithm traces trajectories and domains of the labyrinthine interior of a crumpled ball of aluminum foil which is remarkably rigid though mostly (80%) filled with air.

From the article:

Spontaneous Emergence of Ordered Phases in Crumpled Sheets
Yen-Chih Lin, Ji-Ming Sun, Jen-Hao Hsiao, Yeukuang Hwu, C. L. Wang, and Tzay-Ming Hong
Phys. Rev. Lett. 103, 263902 (2009)

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