Nature Communications, Published online: 20 June 2026; doi:10.1038/s41467-026-74637-1 Dynamical heterogeneity relates to particular local length scales in glassy materials that persist over time. While well studied across a range of glassy materials, its presence in spin glasses remains unclear due to the requirement of nanoscale imaging. Here, using spin-polarized scanning tunnelling microscopy, Niggli et al image dynamic heterogeneity in real space in a self-induced spin glass.