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\subsubsection{Space-multiplex both input and output}  This can be generalised to a Our application definitely meets this specification, since the movement of the device around the  physical space directly maps  to digital mapping. A good example of this can be a computer mouse where there is the events happening inside the game. The accelerometer values provides  a clear relative feedback  mapping of physical tilt  to digital movement. Our system demonstrates this in every action that is performed and so we believe that our system successfully meets this criteria for input specifically. However, physical output speed, but the rotation sensor allows the user to orient the heading  of the system is NOT included map to their heading  in our Phidget controller and so this criteria is therefore only partially met. the real world.  \subsubsection{Concurrent access and manipulation of interface components}