《晋书·志·第一章》
应当相互蒙盖掩蔽，方就都方，圆则全圆，没有方圆不同的道理。
当相覆冒，方则俱方，圆则俱圆，无方圆不同之义也。
Since they should reciprocally cover and obscure each other, square objects would therefore all be square and round objects would be perfectly round.  There is no reason why they should be both square and round.