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Can anyone explain bowling ball Einstein on sheet / global display of gravity?

The bowling ball according gravity seems to be circular and I would love if someone out there help me. In analogy, the ball is placed on a sheet or blanket, creating a charger and curvature. But how? The only way the ball can do is, when a force is pushing or pull the ball down on the ceiling. Now, the marble rolls in the direction of the ball. Again, as it is to roll in the direction of the ball, unless Something to draw on the ceiling?

In our world, if you had a Leaf and put on a bowling ball would cause gravity to this decline. However, in analogy with Einstein, the ball is not caught by an external force, it is a distortion of the smooth space-time. What he tries to show is that mass curves space. Well, if a ball rolls along, it will be deflected because the surface it wants at all blows. Yes, in our model should be something that causes the ball bearings. But here again, Einstein was not affected, such as marble began only was moving. He tried to simplify the four dimensions of space-time in a simplified 2D model.

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