Two young toddlers push large wooden boxes across a gymnasium floor (not actually outside, but the location certainly affords large-scale play in an open space). The boys’ game captures the attention of a nearby girl, and she begins pushing an available box. Notice how she pauses to observe, as one boy pushes his box toward the center of the gym. Sensing that the action of the game may be getting away from her, the girl abandons the box at the perimeter of the gym and excitedly runs to another box close to the boys. The three toddlers momentarily experience pushing their boxes at the same time. Note how the smooth surface of the gymnasium floor supports the children’s ability to successfully move these large boxes. See how one boy encounters an obstacle (carpet) and watch carefully as he cleverly maneuvers his box away from the curled carpet and then changes direction. Just as he does so, the girl encounters a different type of obstacle. Her box bumps up against the raised seam of the floor. The busy action of the game invites a fourth toddler to join. He too, pushes his box until it bumps up against the raised seam of the floor.