https://www.hackster.io/news/richard-huberjohn-s-distance-measuring-desk-robot-is-ready-for-a-game-of-catch-8f9a338b8698
Richard Huberjohn's Distance-Measuring Desk Robot Is Ready for a Game of Catch - Hackster.io
This surprisingly static robot "catches" balls in a net on its back, then measures the distance to the player to lob them back again.