It does usually seem to work out that way because of the materials used. But humans are inventive and will solve problems that present themselves. I seem to recall a theory in anthropology - which was a long time ago - that suggests that tools built for a specific task will always end up looking more or less alike because their whole purpose is to do a job. An oar is a good example. It can be longer or shorter, made out of any kind of wood, color is irrelevant, etc. but it should always have a wide part to move water and a thin handle for the oarsman to grab.
Something is wrong here. War, disease, death, destruction, hunger, filth, poverty, torture, crime, corruption, and the Ice Capades. Something is definitely wrong. This is not good work. If this is the best God can do, I am not impressed.
-- George Carlin