Computer mice do not work in mid air. The reason is that a mouse is really only half an input device--the other half being the surface the mouse is operated on, such as a mouse pad. In this demo, we demonstrate how to combine a mouse and a mouse pad into soap, a device that can be operated in mid air with a single hand. We have used soap to control video games, interact with wall displays and Windows Media Center, and to give slide presentations. Keywords Soap, input, pointing device, mouse, hardware, optical sensor, mid-air input, 10-foot user interfaces.blutwurs ACM Classification Keywords H5.2 [Information interfaces and presentation]: User Interfaces. Input devices and strategies; B 4.2 Input Output devices.