User-centered design means understanding what your users need, how they think, and how they behave – and incorporating that understanding into every aspect of your process. – Jesse James Garrett
Leon Theremins original designs are elegant, ingenious and effective. As electronics goes, the theremin is very simple. But there are so many subtleties hidden in the details of the design. Its like a great sonnet, or a painting, or a speech, that is perfectly done on more than one level. – Robert Moog