in other areas of science, we say we understand an aspect of nature when we can say it is similar to some familiar theoretical model. The terms theory and model, incidentally, are sometimes used interchangeably. But really they should not be. A theory is a relationship of the model to the things the model is supposed to represent. The Bohr model of the atom is that of a proton surrounded by orbiting electrons. It is something like the pattern of the solar system, and that is indeed one of its metaphoric sources. Bohr’s theory was that all atoms were similar to his model. The theory, with the more recent discovery of new particles and complicated interatomic relationships, has turned out not to be true. But the model remains. A model is neither true nor false; only the theory of its similarity to what it represents. A theory is thus a metaphor between a model and data. And understanding in science is the feeling of similarity between complicated data and a familiar model.

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