This invention provides systems and methods that allow a user to change the size of a background used with a graphics-based user interface. The anaxisymmetric deformable leading edge 20 can be formed by an angled leading edge 19 which presents only a portion of the leading edge 18 to a well bore obstruction and allows the edge 19 to move past the obstruction with little or no longitudinal force. The Entertainment System including a database subsystem, a registration subsystem, a server subsystem, and a virtual world providing subsystem.