Well, actually in this case, it’s Duke and Gus in a box.
These brothers hang around in their favourite spot, the famous green box. Duke and Gus have found safety and comfort in the green box ever since they arrived at the shelter. They are supreme scaredy-cats, but have recently moved into a new room with more roommates so they are making more friends. There is another hidey-hole in this room where they hang out with other comrades. I don’t know what they discuss in these private areas, but it must be about The Meaning of Life. Each to his own, at his own speed. So for Duke and Gus, it’s progress.