this motion simulator uses a spherical shape driven by controlled wheels to produce any rotational motion within certain limits . the range of pitch and roll motions can be at least − 15 to + 15 degrees ; yaw is unlimited . there are no moving electrical connections such as slip rings . the physical system can be produced inexpensively . control and simulation display use a smart phone or computer tablet , which , for example , could be one already owned by a family using the simulator .