Fold development for copper sliding against a hard steel wedge. The white line is the surface of the copper. The colored lines are the streaklines obtained from velocity measurements. Selected for an Editors' Suggestion and a Viewpoint in Physics.

From the article:

Mesoscale Folding, Instability, and Disruption of Laminar Flow in Metal Surfaces
Narayan K. Sundaram, Yang Guo, and Srinivasan Chandrasekar
Phys. Rev. Lett. 109, 106001 (2012)

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