It’s still in development and the team captain Christoph Kohstall eventually wants you to be able to send the the Nixie flying with a gesture. It would recognize where you’re standing, snap a picture, then return to the wrist.
From the project website:
Nixie is a tiny wearable camera on a wrist band. The wrist straps unfold to create a quadcopter that flies, takes photos or video, then comes back to you.
Judging by this video, the project has to be kept under tight control! ;-)