Meditation chambers are common for followers of the Force. These private inner sanctums are used by both Jedi and Sith to reflect upon the future, rejuvenate their inner strength, and improve their subtle mental powers. Perhaps the most well-known meditation chamber was built for Darth Vader aboard his Super Star Destroyer, Executor. As befitting the Dark Lord of the Sith, the chamber was an ominous, spherical construct that opened by splitting into two halves like some gaping maw. The pressurized enclosure also included a device that allowed Vader to quickly remove and replace his helmet and breath mask.