Air tap doesn't actually require your finger to be in field of view. Even in the Hololens 1, there is, in fact, a downward-facing camera for gestures whose fiel

Air tap doesn't actually require your finger to be in field of view. Even in the Hololens 1, there is, in fact, a downward-facing camera for gestures whose field-of-camera extends all the way down to your waist.