wearing a VR glass: connecting to the computer the difference between vision and the tactual sensation in the VR world.
the possibility of the connections between sensor with body: arm movement, breath, microphone ---> question: can the user really detect that the movement of the object in the virtual reality world are caused by them?
the possibility of the connections between sensor with body: the distance between the user and the object sensor: Sonic ultra sound distance sensor ---> question: how to difference the object in the real world and the one in the viral world?