The symmetry of objects plays a crucial role in many branches of mathematics and physics. It allowed, for example, the early prediction of the existence of new small particles. “Quantum symmetry” concerns a generalized notion of symmetry. It is an abstract way of characterizing the symmetry of a much richer class of mathematical and physical objects. In this snapshot we explain how quantum symmetry emerges as matrix symmetries using a famous example: Mer- min’s magic square. It shows that quantum symme- tries can solve problems that lie beyond the reach of classical symmetries, showing that quantum symme- tries play a central role in modern mathematics.