From a hand sensor on a desk to the phone in your pocket.
It started with a hand sensor. On October 17, 2026 we plugged a Leap Motion into a Mac mini and built Hand Galaxy, a way to play music and paint light in the air with your bare hands. It was magic, but it needed a special sensor on a desk.
Then the phone became the sensor. Next came an iPhone app using body tracking on the back camera, so you could play table tennis with your whole body, and a sound bath you play by reaching into gongs and singing bowls. That's when the real idea landed: the camera everyone already carries is good enough. The motion consoles on the market sell you a box and a subscription. Body Movin' needs the phone in your pocket and whatever screen is nearby.
Any phone, no app. We moved the tracker into the browser. Google's MediaPipe pose model runs on the phone itself, and the screen and phone pair with a QR code, talking directly when they share Wi-Fi and through a small relay when they don't.
Photoreal on purpose. Every game shares one kit: real HDR sky lighting, 4K photographs of real places, scanned materials and models, filmic color, and original music. The goal was a video of a real place, not a cartoon. By October 18 all twenty-one tiles on the home screen were full games.
Then we played it for real, and it broke in useful ways. Every one of these fixes came from standing in a living room and actually playing:
- Hands came out backwards. Now a faint see-through figure of you is the controller, and its hands are the game's hands, like a mirror.
- The camera couldn't see enough of the room. The phone now picks its 0.5x ultra-wide lens by itself. Then we measured instead of guessing: the same 19 moves with the phone upright and sideways. Upright kept head, hands and feet in the picture for essentially every move; sideways lost the feet on most swings and jumps. Every game is now built for an upright phone.
- Bowling threw away real throws. Stepping into a delivery made the tracker unsure of the knees for an instant, and the game took that as "player not in view". Replaying the real session showed it catching about eight swings and keeping one. Fixed.
- A held lean drifted back to the middle, undoing your aim. Now it stays where you put it.
- Two of you on screen in games with their own player. Now there is always exactly one you, and nothing reacts until the camera clearly sees a whole person.
- "What am I supposed to do?" Every game now opens with a card showing each move as a moving figure with one plain sentence.
Every real play session is replayed through the games in both Chrome and Safari before anything goes live, with special benches built from real swings, punches and kicks.
Made in Humboldt, CA