New artwork from the Hsu sisters of Exit Clov is on display at DCAC under the name “imoM.” This year’s Wall Mountables at the DC Arts Center holds some true surprises. At first glance, this annual fundraising show looks like round two of Artomatic—with less walking, fewer bands, and of course, much less space. Stick around awhile though, and you start to appreciate the wealth of talent hanging side-by-side salon-style: some new faces, some…