All objects on Earth are influenced by gravity which forces things to be pushed downward like a ball rolling down a slope!
However!!
You are about to see a ball moving up a slope which is amazing!!
The balls that you can see are up at the top of the slope!
The balls appear to move up the slope.
The ball moves up from the opposite side.
When the camera angle is changed something strange occurs.
How did that happen? The balls have somehow moved from the top to the lowest position of the slope.
It is a trick that uses an optical illusion.
It is fascinating to see this as it looks like magic!!
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source: YouTube