A ladder barrel for use in Pilates type exercise is disclosed. The control base carries software for a web phone system. Repairing GPs data includes repairing a segment, comprising determining an inaccurate shape data in the segment; and adjusting shape data for the segment based on a repaired base. The navbar user interface is operated in a scrolling manner to display and select a navigation and media guide interface for a desired one of the different kinds of digital media content and device operations by selecting an associated one of the limited set of icons. When a voltage of 50 V is applied to the electrode 7a, 0 V to 7b and 50 V to 7c, the white particles move to the electrode 7a, the black particles move to the electrode 7b, and black can be viewed.