Stand up performances are usually short, where the comedian recites a fast-paced succession of humorous stories, short jokes (called "bits"), and one-liners, which comprise what is typically called a monologue, routine or act. Some comedians use props, music or magic tricks to enhance their acts. Comedy is often performed in comedy clubs, bars, colleges and theaters, but there is no real restriction on where the craft can be performed. Many smaller venues hold "open mic" events, where anyone can take the stage and perform for the audience, offering a way for amateur performers to hone their craft and possibly break into professionalism. In North America, many comedy clubs feature the now-iconic brick wall as the backdrop for stand-up performances.