---The sensing of gravity is achieve by
an encoder that reads the shift of a participant's standing position. Their
inclination and weight shift create the gravity force and rotation force in
the dynamic field; again, in resistance to the counter power, they affect
the horizontal line of light as well as the three dimensional sound environment.
---The sensing of sound monitors of the participants themselves by
way of a sensor attached to the ear; the achieved sound feeds back to the
space as a three dimensional audio environment.
--As for the sensing of position, two cameras detect the shifting
position of a participant's head in terms other coordinate axis in three-dimensional
space.
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