Oh wait....turns out I can fence him in! We decided to purchase a few new items for Jack today: a play yard/baby cage and a blue pool, which I filled with (200) balls. Jack really liked being in his new play area for about 5 minutes. After he realized that he could not get out, he became rather agitated. Ball pit to the rescue - he was quickly distracted by the new toys and was happy for at least another 5 minutes. This new set up may take a little getting used to!