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It’s just meant as a physical analogue to demonstrate some features (namely how the shape of the sheet/gravity affects things that travel on/through it) in a way that people can understand easily.
But it’s kind of a terrible one, because it uses gravity to explain gravity.
If it’s the demonstration I’m thinking of, it uses gravity to visualise the affects of an otherwise invisible force.
It’s just meant as a physical analogue to demonstrate some features (namely how the shape of the sheet/gravity affects things that travel on/through it) in a way that people can understand easily.