By Andréa Picard In praise of pockets—perhaps this is the essence of Liu Jiayin’s cinema to date. Like the handbags and dumplings whose real-time creation in her quietly astonishing diptych (soon to be a trilogy) of Oxhide (2005) and Oxhide II (2009) provide the films with their structuring principles, Liu’s wit, originality, and ingenious deployment…