'A few years ago, I saw a series of Aboriginal paintings on a sandstone cliff face in the Northern Territory. There were characteristic crosshatched images of fat barramundi and turtles, as well as sprayed handprints and several human figures with spears. Next to them was a long gun, painted with white ochre, an unmistakable image of the colonisers. Was this an Indigenous rendering of contact? A work of history, no less? ...'