The "Inception" Thread

[Alex]

My understanding is the levels were:

Yusef is dreaming the city streets level. This is why he has to stay behind when they go deeper (otherwise nobody would be awake in that level for the kick).

Arthur is dreaming the hotel level. This is why he has to stay behind when they go deeper (otherwise nobody would be awake in that level for the kick). And this, I think creates, a problem if Arthur is also the dreamer of the "reality" level.

Eames is dreaming the snow level (which is why he is the only living team member on that level by the time of the kick, Cobb and Ariadne having gone deeper into Limbo and Saito and Fischer both having died into Limbo).

Everybody in Limbo is independently dreaming of Limbo but it is apparently a shared spiritual plane so all limbos are somehow connected (so Cobb was able to get from his part of Limbo to Saito's at the end).