The problem
Presence-aware devices usually mean a camera on your desk. Most people, reasonably, do not want that.
The approach
Use a radar module that only reports positions, run everything on a tiny ESP32-C6 with no cloud dependency, and put the effort into a face that reads as alive from across the room.
What shipped
Working hardware with sub-5 cm position jitter, a live 3D preview on the web and an early-access list for the first batch.