Humor is by far the most significant activity of the human brain.

Analysis is simplifying, breaking down things into parts, picking out strands and elements. Analysis is comparing unknown things with things that are known. Analysis also involves picking out relationships and putting them back together as a whole.

You do not go out into the street in your underwear, although usually you are wearing underwear. The underwear is not visible but it is there all the time. It is the same with concepts. They are there. They underlie practical things we do- even when we are not conscious of them.

If you never change your mind, why have one?

The purpose of science is not to analyze or describe but to make useful models of the world. A model is useful if it allows us to get use out of it.

I do a great deal of work with young children, and if you give a child a problem, he may come up with a highly original solution, because he doesn't have the established route to it.

A good design is not a democratic consensus.