Good design means not leaving traces of the design, and not overworking the design.

People shouldn’t really have to think about an object when they are using it. Not having to think about it makes the relationship between a person and an object run more smoothly.

(The principle of) Design dissolves in behavior is about finding products beautiful not simply because of the way they look, but from the experience of interacting with them.
Naoto Fukasawa from Szita, Jane. “Without a Trace.” Dwell Sept. 2006: 134-140