In 1971 Geoffrey Bardon encouraged Aboriginal people in Papunya community to paint the community school walls biased on their oral history after which he got them to paint on cardboard and canvas.
Due to cultural concerns they changed their style to dots.
Better explanation
here and more
here.
"In 1974 other aboriginal groups saw Papunya paintings for sale in Perth and Alice Springs. They were upset and angry about the paintings They felt the designs on the paintings revealed secret and sacred knowledge.
To overcome objections from these other aboriginal groups the Papunya artists obscured the sacred designs with dots. Aboriginal dot art was born."
Given all this is easily found on the web I cringe when it is regularly stated on the web Barton taught the Aboriginals to paint using dot methods and that is wasn't their own, the tone used is always negative and derogatory without failing.
Examples of dot art long before the 70's used for millennia
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