# Build a pinch-to-spawn-cube scene

Modify `main.js` so that:

1. When the user pinches with thumb + index finger in XR, spawn a small cube at the position of the pinch.
2. The spawned cubes should persist in the scene.
3. Keep the existing cylinder from the starter template.

Only edit `main.js`. Do not touch `index.html` or the importmap.