This is a super cool show featuring works by Carol John and Carl Martin, two amazing artists in Athens who’ve contributed much to the current, hip style of some of Athens’ most appealing places — including Big City Cafe, the Leathers Building and Cine — through their company DOC Unlimited. Cool, industrial-elements mixed with historically preserved details is a style that’s shaped the architectural aesthetic in Athens considerably. As artists, they’re equally exceptional. Trace is located in the Chase Park Warehouses, next to ATHICA and Canopy, 160 Tracy St., in Athens.