Att människan inte kunde måla med 3d-perspektiv innan den tiden går väl eventuellt att diskutera, detta är visserligen avbildningar av djur men ser ju faktiskt ut som personen har besuttit en viss förståelse för teckning.
https://en.wikipedia.org/wiki/Chauvet_Cave
"The artists who produced these unique paintings used techniques rarely found in other cave art. Many of the paintings appear to have been made only after the walls were scraped clear of debris and concretions, leaving a smoother and noticeably lighter area upon which the artists worked. Similarly, a three-dimensional quality and the suggestion of movement are achieved by incising or etching around the outlines of certain figures. The art is also exceptional for its time for including "scenes", e.g., animals interacting with each other; a pair of woolly rhinoceroses, for example, are seen butting horns in an apparent contest for territory or mating rights."