A common mistake that

A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools. Douglas Adams

When I am working

When I am working on a problem, I never think about beauty but when I have finished, if the solution is not beautiful, I know it is wrong.
R. Buckminster Fuller

You never change things

You never change things by fighting the existing reality. To change something, build a new model that makes the existing model obsolete.
R. Buckminster Fuller