Stephen Wolfram, physicist and designer of Mathematica:
"One starts with lots of sophisticated functionality and ideas. And then one begins grinding it down. And one goes on and on grinding until -- aha, this is all just such and such! And one's ended up with something incredibly simple and obvious.
I guess every function in Mathematica is in a sense like a disembodied idea. It's the result of one of these processes of taking lots of pieces of functionality and gradually grinding them down to see the simplest, most general thing than can represent them."