Hold one picture: a world with only two tones in it and nothing in between. An old photograph is the easiest way to see it — the grass, the sky and the coat are all somewhere between black and white, and no other colour is allowed in. Every use of this phrase is that picture put somewhere new. Put it in a person's head and they see only good people and bad ones. Put it on a page and you get black ink on white paper, which is why a written promise cannot slip away. Put it on the side of a car and you get the paint that made American police cars recognisable at a distance.
可以想成一個畫面：整個世界只剩兩個色調，中間什麼都沒有。最好認的例子是老照片——草地、天空、外套全落在黑與白之間，別的顏色進不來。這個詞的每一種用法，都像是把這個畫面搬到不同的地方。搬進一個人的腦袋裡，他眼中就只有好人和壞人；搬到紙上，就成了白紙上的黑字，所以寫下來的承諾賴不掉；搬到車身上，就是讓美國警車遠遠就認得出來的那身塗裝。
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