They need a:

Responsive Billiards Projector!

Play billiards under the sea! In the cosmos! Put on game modes for fun or training modes to level-up your billiards game. This is responsive interactive augmented reality, not just a plain old projector. But be warned that it’s pretty expensive and has some requirements, like optimal cieling height for best placement. But for the person who already has everything (including a pool table), THIS IS AMAZING!