You can watch this endlessly. Physics, motion, reality. The more simple the race, the more you understand the real world. Lava lamps have same effect.
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Marbles
![](https://i0.wp.com/mountaindreamers.net/wp-content/uploads/2020/03/marbleracing.png?fit=1200%2C613&ssl=1)
You can watch this endlessly. Physics, motion, reality. The more simple the race, the more you understand the real world. Lava lamps have same effect.