what it intends to signify, yet it doesn’t realize that which it indicates so clearly. It is like the kind of pictorial road sign that can be used in different countries with different languages and carry a common meaning evident to everyone precisely because it is a graphic, rather than written, sign. It stands in contrast to an entirely arbitrary road sign, like painting part of the road green to indicate, say, a bus route, which doesn’t speak for itself but can only have meaning to the inhabitants