Gravity pool, also known as Grav-Pool, was a popular bar game on Earth in the mid-22nd century. It is unknown exactly how it worked or what the rules were, but it was based on traditional pool, and made interesting and unique uses of Gravity Fields just like Zero Gravity Football. In 2155, a six-week-old Dave Lister was found in a box under the Grav-Pool table of the Aigburth Arms in Liverpool. (Ouroboros) Upon reaching adulthood, Dave Lister still frequented the Aigburth Arms, and had had become something of a legend on the Grav-Pool table.