Numerical simulations of the crystallographically forbidden but topologically allowed nonsixfold vortices in a sixfold multiferroic material. Arrows indicate the cores of the ferroelectric vortices.

From the article:

Topologically Allowed Nonsixfold Vortices in a Sixfold Multiferroic Material: Observation and Classification
Shaobo Cheng, Jun Li, Myung-Geun Han, Shiqing Deng, Guotai Tan, Xixiang Zhang, Jing Zhu, and Yimei Zhu
Phys. Rev. Lett. 118, 145501 (2017)

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