60,000-year-old ostrich eggshell engravings reveal sophisticated geometric planning

More than 60,000 years ago, humans in southern Africa engraved ostrich eggshells with intricate geometric patterns — grids, parallel lines and right angles — that prove far more organised than previously thought. Researchers suggest the designs followed deliberate rules, and the engravers may have planned entire compositions mentally before carving. The findings point to a surprisingly sophisticated cognitive ability in Stone Age humans.

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