Every day that Jack comes to our apartment to play, Ben and Jack assume their positions: Jack climbs in the wagon and Ben pushes him while walking on his knees. Yesterday, Ben decided to try standing up. Thank goodness his socks had treads on them. He did a great job! I leaped to get the camera and caught two shots. As soon as Jack gets out, Ben's pushing abilities are over because the wagon is too light. Maybe one of these days, Ben will be able to walk without Jack's assistance.