When a user makes an input to a computer, there is a necessary delay before the computer is able to respond. For mouse-based computers, responding within 100ms was sufficient to appear ‘immediate’. In touch-based systems, latency is more apparent, represented as a physical separation between the finger and the object moved onscreen. Technologies capable of immediate (1ms) reporting of input to the computer are being developed by Tactual Labs. Such sensors hold the key to the elimination of lag in the user interface.