Take some time to sit down and figure out how many pixels ... But I did plan to populate the entire grid with diffusers (ping-pong-balls) because it will look a bit cooler that way.

Wonderball is an interactive ping pong table which adds a digital twist to traditional table tennis. The hi-tech table uses digital projectors and sensors which track the movements of the ball ...

An curved arrow pointing right. The ITTF (International Table Tennis Federation) has released a video showing the manufacturing of ping pong balls and it's incredibly satisfying to watch.