During my afternoon nap, I dreamt that a plant became essential for human survival at very high temperatures. It was a tuber whose root took hold of the colon and whose sturdy leaves grew out of the rectum. The relationship was symbiotic. The tuber fed on the human excrement while the human body temperature was better adjusted to global warming. Even the highest of temperatures became tolerable. At the beginning, the tail between the legs was ridiculed by most, but it soon became a lauded feature accepted even by high fashion. The only problem was that those who had a tuber in their colon could not sleep on their back any longer. It was best for them to sleep on their stomach so as not to squash the leaves. Otherwise, the symbiotic relationship was a godsend. All it required was swallowing a few seeds of the magical tuber, one of which was almost sure to catch at once. The leaves would grow within a few weeks and last several years at a time. When I woke up, I was lying on my back. Whence the dream, I guess, for it was extremely hot. It did not take me long to realize that the tuber would make it impossible for humans to sit down, either.