For example, this metaphor at some level assumes the fabric, that is space, is somehow anchored at its perimeter and suspended in the middle like a trampoline. Why is the fabric not lying flat on a table? If space was a fabric laying flat on a table, this gravity metaphor would not work. Or, if it was not anchored at the perimeter, but only suspended, the two masses would both fall, without attraction. Attachment or not makes or breaks it.
Another flaw in the analogy comparison to the trampoline is that the trampoline only works because of the gravity below it. Because of this the only correct view of the trampoline is the top view. Saying that there is 'bending' that occurs to space is looking at the side view of the trampoline which is null as an analogy of 3D space or 2D. If the trampoline were just floating in space the experiment wouldn't work at all.
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