That is an interesting theory; when I first viewed your suggestion, I thought you were joking, as I had associated all cave and rock paintings as being thousands of years old. I looked up Zimbabwe Rock Paintings and to my surprise, I found that the San or the Bushmen still exist; their artwork is stunning!
I couldn't find any examples of their artwork on anything other than stone, but I am still looking; the first thing I need to do is confirm that the ax type is from that area.
Thanks for pointing me in that direction!
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