A portable, reversibly-extensible hammock has a foldable structure for supporting a substantially planar support surface. Skives made with the skiving device are clean, neat, and do not damage underlying layers. The first suture support has a first opening and is movable between a retracted position where the first suture support does not extend from the distal end and an extended position where the first suture support does extend from the distal end. In response to the optimal environmental state not existing in the environment, the method may include identifying an environmental condition that differs from the optimal environmental state and generating a command configured to alter an operational state of an environmental device that affects the environmental condition.