I thought of the ending as a non-linear experience of time. The idea that time does not exist and everything is actually happening at once. Also that there is no true death, only change, transformation & rebirth. The universe may only be a small speck more easily traversed than humans believe. Life and all that exists are constructs of each individual's mind. I didn't think too much about the room he was in. I just believed it and let it be what it is--a space where one individual exists, like our mind. Do we think too much? Maybe. But isn't it fun?