In this world, there is no absolute good, no absolute evil," the man said. "Good and evil are not fixed, stable entities but are continually trading places.

An affordance is a relationship between the properties of an object and the capabilities of the agent that determine just how the object could possibly be used.

The difference between a good mechanic and a bad one, like the difference between a good mathematician and a bad one, is precisely this ability to select the good facts from the bad ones on the basis of quality.

If somebody thinks they're a hedgehog, presumably you just give 'em a mirror and a few pictures of hedgehogs and tell them to sort it out for themselves.

Written By Douglas Adams

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