Around 73,000 years ago, in a cave now known as Blombos, someone took a pointed lump of iron-rich rock—ochre—and dragged its tip across another rock, leaving behind a pattern of red, crosshatched ...
Blombos Cave drawing with ochre pencil on silcrete stone. Craig Foster The crisscrossed pattern, drawn on stone 73,000 years ago, wasn't used as shorthand for #artlovers, but the hashtag-like design ...
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