For this study I used the same sgrafitto technique as with #5, but with cool instead of warm colors and combining both Australian aboriginal symbols (meeting place, campsite/waterhole, human and kangaroo tracks, people sitting, spears) with images from a bubble chamber, where one sees tracks coming from the collision of 300 GeV proton in the 30 inch hydrogen bubble chamber at Fermilab (credit: Wikimedia Commons).
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