Human ancestors engraved abstract patterns
Indonesian Homo erectus carved zigzags on a mussel shell
![design carved into shell](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2014/12/bb_Joordens4_recrop_free.jpg?fit=860%2C460&ssl=1)
SHELL GAME A geometric design carved into this shell may indicate that human ancestors took up at least one form of “modern human behavior” long before Homo sapiens came along.
Wim Lustenhouwer, VU Univ. Amsterdam