Sal, space-time is 4-dimensional. The two dimensional "fabric" is something of a metaphor for understanding the effect mass in space-time. And the objects don't have to be "sitting" "on" space-time. They can be below or beside it, it doesn't matter. What matters for the purpose of understanding h concept is that they are essentially points on a plane and the greater the mass, the greater they distort the plane. The balls on a blanket is just a way of isolating and understanding the effect without breaking your brain trying to apply it to 3 or 4 (or more) dimensions.
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<Millenial Snowfkake Utopia>
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