Chirality can be true or false, depending on the symmetry of dynamic propagation. Crystal lattice vibrations, called phonons, can also display chirality as has been shown in some two-dimensional structures. However, truly chiral phonons have never been observed in three-dimensional systems—that is, until now. Researchers from Tokyo Tech have identified these for the first time, in bulk cinnabar. Utilizing pseudo-angular momentum, their method can be used to identify the chirality in crystalline structures.