|Artists Rendering of the Inside of an O'Neill Cylinder Space Colony from NASA|
|The Halo Ring-World|
|Passing a Ball to Yourself in an O'Neill Cylinder|
|A ball thrown through the center of the ring with a low velocity compared to the tangential velocity of the ring will spiral!|
If you're curious, these are the parametric equations used to plot the position of the ball in both frames of reference
If you want the source code, you can grab it here. Apologies in advance for the poor quality of code.