[robocat]

I love the visuals - they are fantastic at showing the difference.

If the visuals were vertical then the filtering might look more natural because time would be left-to-right and balls would have natural gravity and fall "down" through filters? Code runs top to bottom so I'm guessing it would still be clear.

And putting a number in each of the balls might help clarity too :-)

The only crazy thing is that Haskell lazy is pull (right) whereas Ruby lazy is still push - so the lazy keyword is somewhat confusing but that can't be fixed.

I am not criticising and certainly don't want to make unnecessary work for you. Graphic design and animation are dark arts!