eLife Assessment
This important paper provides evidence that visual representations, as observed through drawing, preferentially preserve topological features over metric features. Across three experiments with different age groups and creative converging methods, they demonstrate that holes and T-junctions are relatively preserved as compared to topologically irrelevant L-junctions, and Euclidian features like length or precise angle. Together, these data provide convincing evidence for topology as an organizing principle for spatial representation, but the work would be strengthened by considering a broader range of topological features, or by ruling out alternative accounts, like preserved memory for complex features, motor production limitations, or noisy compression, that may produce a similar pattern without a topological prior.