While most of those who hold that the whole heaven is finite say that the earth lies at the center, the philosophers of Italy, the so-called Pythagoreans, assert the contrary. They say that in the middle there is fire, and that the earth is one of the stars, and by its circular motion round the center produces night and day.
AristotleThe structural unity of the parts is such that, if any one of them is displaced or removed, the whole will be disjointed and disยญturbed. For a thing whose presence or absence makes no visible difference is not an organic part of the whole.
Aristotle