Force chains in a system of birefringent plastic disks of two diameters, stressed at the box boundaries. Courtesy of V. Sathish Akella and Mahesh Bandi, Okinawa Institute of Science and Technology.

From the article:

What Determines the Static Force Chains in Stressed Granular Media?
Oleg Gendelman, Yoav G. Pollack, Itamar Procaccia, Shiladitya Sengupta, and Jacques Zylberg
Phys. Rev. Lett. 116, 078001 (2016)

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