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At the end of Christopher Nolan's Inception we see Dominic Cobb finally reaches his children from which he has parted with for a long time after he was convicted a criminal. It was the longing to see his children that drove him to take on the job of Inception. He spins his Totem (the items each person in the crew that takes on Inception carries to keep track of reality, which is Cobb's case is a spinning top that used to be his wife's) on the table, and then rushes to see his children. We do not get to see whether Cobb is in fact in reality because the film ends before the spinning top comes to a halt. There is dispute whether he is in reality or not, most people think he is, as the spinning top topples slightly suggesting that it would have stopped eventually.
It's called a totem. It helps Leo determine whether he is dreaming or his in reality. They stress that sometimes after doing this many times it's hard to tell. If the top spins this means he is in a dreaming state. And if it falls it means he is in the real world.
Yes, the top represents the only proof of the "real world" within the movie. If the top fails to stop spinning it proves that the current world is the "dream world" and in fact not reality. This is why at the end of the movie it cuts to credits before we discover whether or not the top stops spinning. If it stops it is the real world, if it doesn't then he is just in another dream. Whether the end scene takes place in the real world or not is another question all together. After all, we didn't see Saito actually shoot himself at the end of the movie in that room that resumed after the very first scene in the movie. Crazy isn't it? :P
of course... it is a film that lends itself to many interpretations...like any good work of art. does the top stop spinning...? we are never given a chance to KNOW the answer. does it matter? to me it didn't...it only reinforced the engaging mystery surrounding the entire film. new ideas are not easily implanted...or can they be at all? we can learn from our dreams and suffer from that knowledge. there must be some balance. i believe that christopher nolan acheives it with INCEPTION...
there are verry little particles in space so there is verry little friction to stop the spinning top. but when you touch it it would instantly move away from your hand so there is almost no friction given by your glove.