Inside the boundary Caption-led silent film. All diagrams are illustrative. 00:00:00.000 — Inside a material, boundaries can be extended regions. Ladbrook and colleagues mapped unusually broad structural boundaries in a cuprate. The colored regions here are an explanatory drawing. Ladbrook et al., PRL (2026), DOI: 10.1103/r62x-kt5j. 00:00:13.000 — A smooth map can hide unresolved structure. Conventional graphene Raman maps average over the laser spot. Finer variations can affect spectra without being individually imaged. Neumann et al., Nature Communications (2015), DOI: 10.1038/ncomms9429.