Somniative (a.k.a. Christopher Reitmaier—scroll down on the link) produces round, metal pieces so intricate they could probably be used for currency in any art-loving sovereignty. You wouldn't expect that he finds his materials on city streets.
2928 NE Killingsworth, Portland, OR 97211
Hours: Thu-Sat-12pm-6pm, Sun 12pm-5pm, Tue-Wednesday by appointment only. Last Thursday Alberta Art Walk 6pm-9pm