The child has found a bottle that fits perfectly over the black tube. After placing the bottle over the tube, he scoops some water from the tub. As he lifts the water out of the tub, he quickly takes a measure of the water in the cup and dumps a little bit back into the tub. He carries his water to the black funnel and pours it into the black funnel. Immediately, he returns to the end of the tube where the bottle is. He gets right down to the level of the bottle and watches the bottle fill with water from the tube. At one point, he exclaims: "Wow!" He repeats the operation, this time a little faster. Again he checks on the bottle filling up with water. He does the operation a third time.