A random passerby helps Aboriginal artist Mark Blackman touch up the decorative border of a painting of the mathematical symbols for "not greater than" and "not less than." Blackman also collaborated on decorating a Volvo station wagon Aboriginal style with Mark Atkins, who after playing didj for 20 years replicates the sounds of the Australian outback--dingos, kangaroos, kukaburras--and renders an urban soundscape replete with trains, jets, telephones, and fax machines. Or were my ears playing tricks on me?