Such work e.g. here: https://www.nature.com/articles/s41597-020-00704-x
hatching and crosses are used even today on tools to make them easier to grip. We'd expect them on smooth and hard tools made of bone or rock.
https://en.wikipedia.org/wiki/Knurling
These patterns are found in paintings too.
hatching and crosses are used even today on tools to make them easier to grip. We'd expect them on smooth and hard tools made of bone or rock.
https://en.wikipedia.org/wiki/Knurling
These patterns are found in paintings too.