A half implies a whole. A whole can usually become half. A half is not a half unless there is a whole, but a whole can be whole without a half. But there are precious few things that cannot be made a half from a whole, though sometimes you have to break them to do it.
Yet there are also things that are distinct and yet are not comprised of halves. For example, it could be said that I am not half body, half spirit, in nature as a human being, I am fully body and fully spirit.
And in the spirit of halves, I’m going to keep this post absurdly short.