I'm not sure what it is about my children, but they seem to have some sort of mad attraction to porthole-type assemblages in playgrounds. If there's a place where they can play peek-a-boo, they will. Sometimes by force. Passersby need to approach them carefully, lest they be drafted into emergency peekabooing.
And then they go and try to play on playground equipment which they are not old enough for. Rock climbing. Humph. Ideas above her station.