Jonathan is in an imitating phase right now. Particularly if we ask him to, he'll copy just about anything. He'll pat his head, or sign "more" and "all done" or sniff his nose like a bunny, or turn upside down, or or or! The really cool thing, though, is that he isn't just copying our actions. He's also processing our words. After the first couple of examples, he'll do these actions just given a verbal cue - "Jonathan, can you turn upside down?" And upside down he goes!