I used to work at a place that had the famous Antoine de Saint-Exupéry quote painted near the elevators where everyone would see it when they arrived for work:

  Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.

Original French: "Il semble que la perfection soit atteinte non quand il n'y a plus rien à ajouter, mais quand il n'y a plus rien à retrancher".