Virtual Reality
VR: Virtual reality simulations indistinguishable from reality
VR will be the first sea-change technology to be developed - we are nearly there already. Once the data-transmission rate is high enough and the VR rooms or headsets are inexpensive enough, we will not be able to tell whether we are perceiving a real location or a virtual location. Actual travel will only be necessary to experience or participation in physical-contact activities. All other travel will be optional within the distance where speed-of-light communication does not create unacceptable delays. For office workers, no more offices, no more commuting.
Under construction:
Eye/nail tracking
ball floor