A favorite from last year's Fringe, Matthew Marcum, returned for another performance of Pollock: A Frequency Parable. It is hard to explain. The show starts with images and words from the painter Jackson Pollock. It proceeds with the energy of Pollock's painting technique through physical expression, singing that slips into ululation, ecstatic, seemingly out of control but leading to an emotional conclusion. Once again, I thought it was a knockout.