Have you ever built tracks for racing Hot Wheels cars? I did that a lot, I’d race my cars from the window in the dining room all the way across the house through the living room.
Scott does a lot of that kind of thing, except he uses big marbles instead of Hot Wheels cars, and one of the tracks he built especially for the swimming pool!
He built a huge tower from the bottom of the pool to hang his tracks on, plus even more tracks sitting on top of buoys just floating on the water, plus elevators and tracks underwater.
It’s a really intense build, you should check the whole thing out: