Design evidence # 111: The heart

You bring up an excellent point here, sonnikke. However, it works against you as well as against the argument you were addressing: how can anyone claim design without "knowing what is good, what is simple, what is necessary, how to design it, build it, maintain it, etc."? How IS it possible to detect design - whether human or divine - without knowing the actual causative history of the particular object or system? How can we objectively tell that this is designed but that isn't?