Hearing is high-abstraction, not high-bandwidth (that's why you can transfer voice with so little bandwidth over wires and waves). Other than that, your analysi

Hearing is high-abstraction, not high-bandwidth (that's why you can transfer voice with so little bandwidth over wires and waves). Other than that, your analysis is spot-on. You're missing proprioception, often deemed as a sixth sense. Tools like Kinect can be used to convey commands - postural and gestural input are not really dependent on touch, and can nevertheless used for input (and output?).