Mijn stiefdochter doet dit omdat ze het leuk vindt.

One time I invited a friend of mine to spend the afternoon here at home with me and my stepdaughter. During the afternoon of that day, we went to watch TV in the living room, we put the balls on the floor, it's a sign that she already knew she had to do it and in fact she started doing it, what she likes to do most when we're alone at home .