The incredible upside-down hallway fight scene in "Inception" consisted of a 100-foot revolving set.

From the real exploding Paris café scene to the many dream collapsing miniature set pieces, Christopher Nolan's "Inception" enters dreamworlds without ever really leaving reality.

The coolest scene in the film that didn't contain any CGI was the Joseph Gordon-Levitt spinning hallway fight.

Nolan pulled off the rotating hallway by building a 110-foot corridor that could rotate on suspended rings with the actors inside of it.

"There's no substitute for real human energy and performance," Gordon-Levitt said in the featurette about acting inside of the rig. "That was the most fun."