Yeah, the forever spinning thing is hard to explain under the rules given. The architect remembered to make it a part of the dream that a truck driven off a bridge falls into the river, how hard is it to automatically apply other rules of physics somewhat automatically.
That said, there had to have been some unique aspect to Cobb's top otherwise anybody who knew he had a top as his totem would be able to replicate it easy enough. So it shouldn't have been that it fell or didn't but that it fell in some unique way.
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