“[T]he performers [of Canada’s] Les 7 Doigts de la Main don’t just dazzle by flying between poles; they offer up snippets of personal information as they irritate, bond and flirt with each other. They are so human, it feels all the more astonishing when they hurl themselves off poles. … [The Australian troupe] Circa’s show, meanwhile, strips back circus to a basic manipulation of form and space to create something akin to sculpture.”