Quote Originally Posted by Puffin View Post
I'm confused as to why this debate is still going on. Near the very end, you see the totem wobble, which means it's going to fall over. In a dream, unless picked up, it'll keep spinning without wobbling. So no, I don't think he's dreaming.
Cobb explains purpose, origin and significance of totem to Ariadne.
Ariadne knows the layout of Cobb's home/memories.
Ariadne also knows the condition of Cobb's mental state.

If the totem falls or not in the end is irrelevant.

Ariadne's purpose was to take over where Cobb had left off.
Yes, it was a dream.