Augmented reality (AR) and mixed reality (MR) headsets let us see the world around us with virtual elements superimposed on top. For example, many modern AR/MR headsets use hand-tracking cameras to detect hand gestures in the air, which allows users to type on a virtual keyboard that appears to be floating in front of the user. As exciting as this sounds initially, the approach often needs handheld controllers, and keeping your hands in the air for a long time can cause arm fatigue. These air gestures also lack physical feedback, which can make interaction less comfortable.