The Opus collection from Tropitone provides high function, stackable outdoor furniture design  - without sacrificing high style.  And of course, because this sling patio furniture uses stackable chairs, they can be moved out of the way when a large gathering turns into a smaller conversation. Opus's flowing, contemporary lines celebrate simplicity and purity of form translated into stylish, yet practical outdoor furniture. This combination of artistry and elegance, designed by John Caldwell, is a natural addition to any outdoor environment.