A rendition of a nonlinear fluid flowing through a disordered porous (Swiss-cheese) medium.

From the article:

Non-Newtonian Fluid Flow through Three-Dimensional Disordered Porous Media
Apiano F. Morais, Hansjoerg Seybold, Hans J. Herrmann, and José S. Andrade, Jr.
Phys. Rev. Lett. 103, 194502 (2009)

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