Stone‑Age Geometry at 60,000 Years

A PLOS One analysis of 109 ostrich‑eggshell fragments from South Africa and Namibia (dated ~60k years ago) scored 1,275 etched lines and 1,405 intersections and found statistically nonrandom geometric structure — parallel lines, repeated 90° angles, grids and rotated motifs — implying early, rule‑based graphic systems. The patterns were produced via cognitive operations like rotation, translation and iteration, not random doodling. — This pushes back the timeline for abstract geometric thinking and social graphic conventions, affecting debates about when humans developed symbolic, proto‑mathematical cognition and how cultural knowledge spreads in deep prehistory.