so… a few thoughts. i think i have it all figured out pretty tidily, so have at it.
1st thought - totems - leo’s totem is something of much contention. the fact that he uses mal’s totem lends itself to questions of what’s the REAL totem? imo this can be easily explained away if you can accept that leo has MANY totems (tells), most of which have already been pointed out. i’m just merely saying it doesn’t have to be one or the other. the top, the wedding band, and ghost Mal are all totems. heck, the looped staircase, zero G, and the levels themselves are all totems, if you know to look for it. leo himself said - architects don’t model the levels out of existing places or else you won’t be able to distinguish the dream world from the real world.
2nd thought - dying vs dead. just like how sleep has progressions (1,2,3,4,REM), dying is a progression of fading into unconsciousness, organ failure, clinically dead, and past of resuscitation/gone-for-good dead. you go into deeper levels of dreams in Inception by going unconscious either through the dream machine or as Fischer did in the snow fortress via natural means. SO… fischer in going unconscious descends into unconsciousness leading to level 4. saito’s slow/steady blood loss up in level 1 allows him to slip quickly (in the context of stage 3 time) through unconsciousness into death/limbo. So… in my understanding - unconsciousness slips you into deeper and deeper levels, theoretically forever. dying detours you straight to limbo.
3rd thought - level 4 (not limbo). it’s been established that different levels are dreamed up by various members of the group. 1st level youseff, 2nd gordon levitt, 3rd forger. Level 4 is simply another dream, this carried out by Leo’s subconscious Ghost Mal. the subcon is able to be the dreamer since level 4 is teetering on the edge of limbo (entirely subcon). Level 4 has to be its own level and not limbo because… ariadne and fischer are kicked up and you don’t get kicked up from limbo.
4th thought - limbo. Limbo is a place so deep that you forget you’re in a dream all together. only with a trigger like a totem would you even have a chance of remembering what’s really going on. saito’s aging was proof about how deep he bought into the lie, however some are ignoring the fact that Leo himself was disoriented too. he was glassy eyed, and shoving gruel into his mouth instead of focusing on saito. saito really saves the day by noticing the top which triggers his memories (totem alert) and his speech about obligations (kids totem alert) in turn triggers leo’s memories. then it’s obvious that saito shot the both of them back to reality.
5rd thought - the “reality is really a dream” opinion is bunk. Leo dreams into deeper layers repeatedly throughout the movie. you can’t sleep from limbo into deeper limbo. if you can, then that means there’s an infinite number of limbos. if that were the case, there is no difference between dream levels and limbo. if the two are one and the same, then dying in any level would wake you up instead of sending you into limbo. of course if you go extreme-meta and say the rules of limbo are just dreams to begin with, that explains away everything but i feel like if you’re going to undermine the entire canon of the movie just to prove a point.
6th thought - plot hole; ellen page’s emotional yet inexplicable leap from the balcony - again, as it is with most of the movie - the discrepancy comes in the difference between level 4 and limbo. gordon-levitt plants charges to ignite a kick that would wake up the crew from the snow level. sure. i get that. why does the forger plant charges to kick ariadne/fischer? because they’re in level 4 right? he puts ariadne and leo on the sleep machine - knowing full well they’re going into level 4 and needs a kick to wake up. ok. once there, to escape ariadne feels the need to… jump off the building? why? if it’s suicide, she’s operating under the assumption she’s in limbo. if that’s the case, why plant charges? if she’s jumping off to simulate the freefall of a kick… WRONG. you can’t kick yourself. you need the level above you to kick you, which the forger does with the charges. i mean, visually it’s a stunning scene and evokes a good chunk of emotions but logically speaking… it makes no sense.
OPINIONS: wow. what a thriller in every sense of the word. the plot was pretty straightforward with exception to level 4 and limbo. visually it’s stunning with FINE attention to details (notable - tiny droplets of zero-g blood floating out of ken watanabe in the hotel). the music and sound effects were outrageously effective, and the action scenes are phenomenal. to call it a ripoff of the matrix is an insult. what, no movie made after the matrix can have interesting fight scenes without it ripping off the matrix?
i have some beef with the handling of level4/limbo. it was just poorly handled and i hope it wasn’t intentional as to be clever or to stimulate thought. i mean, making people ponder the essence of “reality” is one thing but to make people ponder the nuances between dream level and limbo is pedantic.
i DIDN’T like the wink at the end with the top and the wobble was needlessly incendiary. a more poignant ending would have had leo look at the top and decide to not spin it at all. once it’s spun, the die is cast for him. he’ll find out if he’s dreaming or not even if the audience doesn’t. in not wanting to find out sets the audience up for a real debate on the reality of “reality” without mucking it up with mindless chatter about wobbles vs continuous rotation.
*bonus conspiracy theory - maybe not the entire thing was a dream but everything from the mogadishu basement was. leo did “wake up” from it but as he was in the bathroom spinning the top, watanabe interrupts and leo knocks his top over, and doesn’t see if it’s continuously spinning or would stop on its own. and if iirc it’s the last time that the top is used.