Walter has a new fascination with the stairs. He's never shown much interest in climbing them before, even with Molly taunting him. (She's learned to sit just a few steps out of his reach.) I caught him three steps up today, and now climbing is all he wants to do. I take him into another room and he immediately turns around and heads for the stairs again. He's pretty quick about going up, but has no idea how to get back down. He just turns around and stares at me until I pick him up and return him to the bottom so we can start the game again.