My job is simply to design gadgets that I like Inventors are people who not only curse, but who also start to think of what can be done to eliminate the bother...When I see something that I don't like, I try to invent a way around it. My job is simply to design gadgets that I like. Jacob Rabinow, The Evolution of Useful Things The iPodYou and your user are one innovation
Economy of material and labor Whatever the comparative merits of [various bed framing methods], what is clear from Aristotle's Mechanica is that economy of material, and labor, was as much an issue in ancient times as it is now. Henry Petroski, The Evolution of Useful Things The requirements of economyThe art of not constructing simplicity