Unit cell of a three-dimensional acoustic lattice composed of resonators (orange) connected by coupling tubes (red, blue, and gray). Selected for an Editors’ Suggestion.

From the article:

Observation of Embedded Topology in a Trivial Bulk via Projective Crystal Symmetry
Hau Tian Teo, Yang Long, Hong-yu Zou, Kailin Song, Haoran Xue, Yong Ge, Shou-qi Yuan, Hong-xiang Sun, and Baile Zhang
Phys. Rev. Lett. 135, 136602 (2025)

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