It makes as much sense as the rest of the dreams do -- which is of course to say that your mileage may vary.

The whole premise is that one dreamer constructs the world of the dream, which everyone then enters and shares. At the top level, Yusuf was the dreamer and everyone was sharing the world that Ariadne had taught him and that he constructed in his mind. The next level down, same thing, but this time the world was a construct in Arthur's mind that everyone was sharing. Next level down, a construct in Eames' mind shared by everyone.

Because Cobb had, in another context, already been to limbo, there was already a construct in his mind to inhabit if they went down that far. Hence, anyone who wound up in limbo wound up in Cobb's dream.

If Cobb had not been part of the team, or alternatively if Cobb had never been to limbo, limbo would have been formless for the first person to arrive there, but whatever he or she constructed in limbo would then have become the common construct for anyone else. But because a construct already existed in one member of the team, when they shared minds they shared the construct.

Presumably, if two of them had previously -- but separately -- been to limbo, the team's shared limbo would have been an amalgamation of the two preexisting constructs.

Here's a cool little video where all the dream levels are put side by side for comparison.

I'm late to the party, but PHEW! what a party it is. I pretty much agree entirely with Michael and Teague: awesome flick but Nolan made some odd choices. He pulls out some big, big guns in the scenes where Page gets recruited and then mostly leaves them on the mantle. You can almost hear Egon saying "Don't cross the streams!" ...But then they never do cross the streams.

Worse, Page is immediately relegated to being DiCaprio's psychologist. We don't even get a montage of her designing the levels. What the fuck? Even Rocky had a montage!

Regarding the "train > people > Mal" progression of Cobb's obsession intruding, that works great thematically, but cinematically, it's awful. Trains are more cinematic than crazy wives.

Regarding the ending: (SPOILERS FOR OTHER NOLAN FILMS) I was pretty convinced the whole time that the entire story was in Cobb's head and that the players were going to turn out to be working for Mal to get Cobb to wake up and be with her and the kids. Cobb planting the idea that Mal wasn't in reality and that made her obsess and kill herself was goofy: they created their world together; of course she knew she was dreaming. Besides, Nolan ALREADY USED the oh-god-it's-my-fault-my-wife-committed-suicide gambit TWICE, in Memento and The Prestige. What next? Bruce Wayne's parents' death will turn out to be suicide, and it's Bruce's fault?!

I'm on it. I'll start writing 2011: Superbat vs Superego tomorrow evening. Cross your fingers. My other 9 screenplays for the Asylum are in development hell.

Yeah, i recently saw it too. It was great to see Tom Hardy. He was so meh in ST: Nemesis. I'm not a big Leonardo fan but he was good in this. I loved the way they didn't stop to explain everything, kind of the opposite of Avatar in that sense, but to be honest i was lost a few times. It might actually be good to get the first viewing out of the way, so i can enjoy it now.

The invisible harmless PG-13 bullets annoyed me. Did it look to anyone else like the snow was falling at 100mph as the van fell in the water in slowmo? Antichrist did it better with a budget $150m smaller. Inception didn't have a porn monster shot either.

Overall it was great but i wish Nolan was a little less... mainstream.

To be fair, my screenplays are mostly pictures I've clipped out of magazines or found on the Internet and given different captions. My screenplay for 101-Foot Geisha is just a single picture of a naked Japanese girl with little tanks pasted at the bottom and the words "OMG! Radioactive sushi made her 101-feet tall! Now she's attacking our city!" A word balloon coming out of her mouth says, "Me so hungry!! "

That one's getting good buzz. It's in second draft now. I gave her pointy teeth and "angry eyes".