Project by Francesco Tacchini is a floating sphere that records and replays the sounds from it’s surroundings - video embedded below:
Space Replay is a hovering object that explores and manipulates transitional public spaces with particular acoustic properties. By constantly recording and replaying these ambient sounds, the levitating sphere produces a delayed echo of human activity.
Sensors and an Arduino were programmed and inserted into the sphere.
You can find out more about the project here