So, it's something you thought up yourself? Or did you see or hear about it somewhere? If so, please provide a link or reference.
It's something I've stumbled on upon thought and reflection. I don't have a link and I'm not even sure it's accurate. I'm sure that others have thought the same thing.
But it's based upon the famous example of gravity where they put a heavy object like a bowling ball on trampoline like surface and then throw a tennis ball or something around it so it spins around.
The problem with that model is that the trampoline is supposed to represent space/time. So to get an accurate picture you have to imagine that you're within that fabric. Further we KNOW that space/time is expanding so we have to imagine ourselves within that fabric as it is constantly stretching, or expanding, around us...always.
I think this is what Einstein was modeling with his math but we have tough time imagining it so we default to the trampoline explanation.