Ultra-low-friction AR interface will be built on two technological pillars:

1. Ultra-low-friction input, so when you need to act, the path from thought to action is as short and intuitive as possible. You might gesture with your hand, make voice commands, or select items from a menu by looking at them — actions enabled by hand-tracking cameras, a microphone array, and eye-tracking technology.
But ultimately, you’ll need a more natural way - neural input, e.g. wrist-based electromyography (EMG).
Wrist-based EMG reads the signals on the motor neurons that run from the spinal cord to the hand. The signals through the wrist are so clear that EMG can detect finger motion of just a millimeter. Ultimately it may even be possible to sense just the intent to move a finger.