The best tech looks like no tech at all
Really, everything should be that way. Whether I’m architecting a piece of software or uploading photos of double backflip expert skier moves to Facebook seconds after doing a 360 off a halfpipe (watch the Thalmic video), the body should be the interface. No need for an intermediate keyboard, mouse, modal text editor, etc.
Countless tech companies market their user interfaces as “intuitive.” No interface that requires you to memorize the location of a bunch of buttons is intuitive. (Think about the amount of productivity lost in our daily efforts to translate thought into keystrokes. Phone apps, I’m looking at you too!)
The effectiveness of your interaction with technology should peak at the effectiveness of the actions you want the tech to take in the real world. It should not peak at the net of your intended actions and the effectiveness lost in the time, effort and rote memorization required to exploit an interface through an imperative intermediate device. (Imperative device here meaning one that accepts sets of instructions on how to accomplish the high-level task, like “turn left,” that you send to the machine).
The best interfaces are declarative. Tell the machine to move left, to fetch, to build. Don’t drive it, direct it or implement the details.