Traces versus Zarkana
There's something in the water in Montreal. They pump out body-defying acrobatics wrapped in tongue-in-cheek excess like a virus. Despite the shared core, two Canadian exports leaped into town, and they couldn't be more different. Traces, at the Union Square Theatre, makes Zarkana, at Radio City Music Hall, look like Cirque du So What? Zarkana is like a bad online date. The poster is attractive, but what meets you a…