Comment by TallGuyShort

Not a huge Steve Jobs fan, but I had a professor who had worked as a designer under Steve Jobs and tried something similar. Steve insisted that a new mouse needed to be just a fraction of a millimetre slimmer so a person's palm was lower and closer to the work surface. They figured he was being an unreasonable "delicate genius" and returned a few days later with the identical mouse and claimed they had reworked it to be a little slimmer. He held it and immediately said they had done nothing and the size was identical to before. They took it and reworked it to actually be about half a millimetre slimmer, showed it to him, and he said it was perfect.