Ok, this is the most complex movie I've seen in my lifetime. I couldn't even tell the difference between a dream and reality because the only indication was if there was a disturbance or paradox. The main indication was the spinning of a top, and if it stayed in one place and kept spinning, then you'd know that you were in a dream. But they have to go into so many dreams. They have to go into about four I believe, but it's just a hassle to keep track of. My advice is, if you have the IQ of Stephen Hawking, then this is the movie for you, but if you're looking for a simple idea (that doesn't take 2 hours to plant), then I say you should forget about this. I barely followed it! But in retrospect, I was watching this at 11 o' clock at night, so that might've added to how tiresome this movie seemed to be to me. Now that I've read the synopsis, I can understand it better, but you shouldn't have to do that to understand a movie.