That gets you into the marble run world... which is segment of YouTube... and there are some very impressive setups.

https://youtu.be/qGsD19P16rs

As an aside, there's an app out there is an app for the iPad called "Cuboro Riddles" which is a "how do you make the marble go from here to there using the blocks." Given that there are multiple ways that a block can channel a marble, this is a tricky one.

... and then if you get this over into the lego domain (not as "just something to fiddle with..." it gets you into the GBC. There is a standard for how one connects to another described at https://www.greatballcontraption.com/wiki/standard ... and then at lego conventions people hook them all up. https://youtu.be/avyh-36jEqA