Ancient ostrich eggshell engravings hint at humanity's first geometric grammar

Analysis of 112 engraved ostrich eggshell fragments from Diepkloof, Klipdrift, Apollo 11 and Namibia shows that over 80% display coherent spatial organization—grids, parallel lines and right angles—indicating intentional, systematic thought and suggesting an embryonic visual grammar marking early geometric and abstract thinking about 60,000 years ago.