"The products we design are going to be ridden in, sat upon, looked at, talked into, activated, operated, or in some way used by people individually or en masse. If the point of contact between the product and the people becomes a point of friction, then the industrial designer has failed. If, on the other hand, people are made safer, more comfortable, more eager to purchase, more efficient-or just plain happier-the industrial designer has succeeded."
Source : Max Planck (1959). “The new science: 3 complete works: Where is science going? The universe in the light of modern physics; The philosophy of physics”