Simple, practical decisions executed at a really high level often give a feeling of confidence in the experience.

design How things should be made and judged: what makes a design good, who should do the designing, and what an interface is for.

simplicity Less, but better: reduction as the way to make something good, and the argument about when it goes too far.

ideas vs execution Whether the idea or the execution behind it is what actually decides an outcome, and who deserves the credit.