Few, if any, of Australia's city flags tick all of these boxes. " [But] city flags, like all flags, are a form of art and art is always subjective," Dr Jones says. The 'good'?

A yellow circle in the centre for the sun. This is the design of the Aboriginal flag, which is seen all over Australia - atop bridges and buildings, painted on walls, printed on T-shirts.

Fearful that the flag would be reproduced overseas Mr Thomas sought to protect his work by seeking copyright over the design, subsequently this was granted by the Federal Court of Australia in 1997.

The Aboriginal art of northeast Arnhem Land in Australia is both ancient and recent. For thousands of years, the Yolngu people of this remote, culturally rich region have been painting in the sand ...