Wallwalks are gravity walkways that allow the denizens of the Sphere to move in unexpected ways.
Wallwalks are light-blue glowing altered gravity paths that let's Tommy walk upright regardless of orientation. This means that depending where the wallwalk goes, Tommy can walk on both walls and ceilings. At the same time if the Tommy falls or tries to jump off the path, gravity will reassert itself back to normal. Sphere denizens mostly use wallwalks to better use the limited space that the Sphere offers.