Sponging is an activity that Otis loves at our Montessori Parent-Toddler class. Two bowls, one with a small sponge and some water. The child uses the sponge to transfer the water from bowl to bowl. This is an activity that I have used as a diversion at school. Otis loves water play (like most toddlers I'm sure). If he is taking a long time washing dishes or at the art sink, or another child is waiting, I will divert Otis to the sponging so he still fulfills his need for water play.