You own a watch the invention of the mind, though for a single motion 'tis designed, as well as that which is with greater thought with various springs, for various motions wrought. ↗
I don't think necessity is the mother of invention. Invention, in my opinion, arises directly from idleness, possibly also from laziness - to save oneself trouble. ↗
All of the biggest technological inventions created by man - the airplane, the automobile, the computer - says little about his intelligence, but speaks volumes about his laziness. ↗