Trial by fire is nothing compared to Clarion Alley's street-art test: unless a piece is truly inspired, it's going to get peed on or painted over. Very few pieces survive for years, such as Andrew Schoultz's mural of gentrifying elephants displacing scraggly birds, or the silhouette of kung-fu-fighting feminists that make Charlie's Angels look like chumps. Incontinent art critics seem to have taken over the east end of the alley – pee-eew! – so topical murals like the new one honoring the Arab Spring usually go up on the west end.