After the last war, in 1948, Australia decided to learn something about the country they fought such a fierce war about. An expedition was sent to Arnhem Land, thus far hardly known part of the country. It was led by Charles Mountford. During the expedition paintings on bark were collected. Those paintings show what Aborignal bark paintings were like before trade in them started.
Later missionaries were bying bark paintings and reselling then in the cities of the coast. They paid the artists according to the time spent on painting. So it paid (literally) to spend as much time as possible painting it. Which is why later paintings have a multitude of little strokes, but the ones gathered earlier seem to be much simpler.
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