The lights go on. The lights go off. Another year goes by. The patch of sky remains unchanged. Another year goes by.
Food is put in.
When you pace in boredom, or in hunger, or in discomfort, you can not walk very far before coming to a wall, or your water bowl, or the growing piles of wastes from the last several days. And still another year goes by. Five years have now passed. You are still alive. There are many people who state that certain reptiles, including many snakes, feel comfortable only when they can feel their environment around them.