[Animats]

The first 10 seconds pretty much covers the subject.

It's not the hoop, it's the shape of the backboard, which is a reflector formed to focus the ball on the target.

Now, the really cool thing would to build a flat backboard with controlled bounce properties. Interesting 3D printing problem. That would look like an ordinary backboard but still focus bounces.

[elliottkember]

The solution is explained pretty quickly. But the implementation in the rest of the video is still worth watching!

[jansan]

Another idea would be a hoop controlled by servos that always moves the hoop where the ball is going.

[Animats]

People would see. Something that just works, invisibly, though.

[hkiely]

This is pretty cool.