Why is gravity visualized by putting a heavy object on a flat plane, creating the curved shape, when space is 3D?

Question

Wouldn’t it curve and pull objects in all directions?

In: 279

Answer 1

Because we can’t quite visualize a 3d space as that would be empty air.
With the heavy objects on say a trampoline you get to see how the heavy object is making a dent in the fabric and that this dent makes other objects on it get attracted to the greater mass.

To convert this to 3d space you just need to think of this happening in all directions.