Look at the marbles in this video. They all think they're different. In weight, or shape. They have no idea where they're going. But they're still going. Because the path they're on, it's designed that way. They're trying to race each other to the finish. Do they not know they'll eventually end up in the same place?
Are we still talking about marbles?
For now, yes.
This Marble Run "Marble Tsunami" has 4 tipping containers holding totally more than 11.000 marbles. In this video you'll see the 10.000 marbles AND the 1000 marbles container will tipping together causing more than 11,000 marbles rolling down the giant tracks.
Check it out. It's oddly satisfying.