Designer, implementor, user, writer A Fragment by Donald Knuth dl.acm.org Thus, I came to the conclusion that the designer of a new system must not only be the implementor and the first large-scale user; the designer should also write the first user manual. The separation of any of these four components would have hurt TeX significantly. If I had not participated fully in all these activities, literally hundreds of improvements would never have been made, because I would never have thought of them or perceived why they were important. Eating your own dog food making
Useless work on useful things Anyone can verify by simple observation two important facts. The first is, that whenever humans design and make a useful thing they invariably expend a good deal of unnecessary and easily avoidable work on it which contributes nothing to its usefulness. The second fact is that all useful devices have got to do useless things which no one wants them to do. Who wants car to get hot? Or to wear out its tires? Or to make a noise and a smell? David Pye, The Nature and Aesthetics of Design The works of GodIf you have to do tedious workWe might as well make them beautifulAgainst form follows functionCombinations and arrangements function