Simulated frictional packings of polydisperse disks decompose into rigid clusters (black, purple, and green) and regions of floppy bonds (gray).

From the article:

Rigid Cluster Decomposition Reveals Criticality in Frictional Jamming
Silke Henkes, David A. Quint, Yaouen Fily, and J. M. Schwarz
Phys. Rev. Lett. 116, 028301 (2016)

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