I always figured that the oldest known art work was the paintings on the caves at Lascaux, but it appears there is another category in the ancient art world – the studio! Or perhaps it is best described as the paint manufacturer. I think many people forget how much chemistry there is in art – here’s an article about some of the pigments that they worked with about 42,000 years ago.
It seems though that they hadn’t gotten into being muralists at that time, likely just body painting. So that classifies it as time-based art. Or beauty products…..