I used to do flight simulation with a head tracker to control the virtual cockpit perspective. Hardly any mass added over regular headphones, but it was a world

I used to do flight simulation with a head tracker to control the virtual cockpit perspective. Hardly any mass added over regular headphones, but it was a world of a difference between holding my head in whatever position that felt comfortable to see the screen and holding it in exactly the right angle to point the camera to where I wanted. It's fun and a great improvement over manually controlling the camera, but also surprisingly exhausting.