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Quote of the day

Of all the dear sights in the world, nothing is so beautiful as children when they are giving something. Any small thing they give. Children give the world to you. They open the world to you as if it were a book you'd never been able to read. But when a gift must be found, it is always some absurd little thing, passed on crooked. . . an angel looking like a clown. Children have so little that they can give, because they never know they have given you everything.

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John Henry Holland

Model building is the art of selecting those aspects of a process that are relevant to the question being asked. As with any art, this selection is guided by taste, elegance, and metaphor; it is a matter of induction, rather than deduction. High science depends on this art.