Look at the two people walking along the shore. We say married people "become one." How is that possible. (No, don't think that literally — that's not what I mean, though that's a part of it.) If separated, would they be half of one (half of a couple)? Or would they be "back to [square] one"?
Cut a lemon in half. Would you say you now have two lemons? Or are the two pieces halves of one?
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Just for Ginnie (see the comments, below): Is this a better example, Ginnie?
