Christopher Nolan's "Inception" is a stunning achievement of the modern blockbuster era. It began mostly as a favor to Nolan from Warner Bros. to keep him happy enough to stick around for a third Batman movie, but what the director did with that one round of backscratching is create the kind of film we may not see for a long time.
"Inception" is an action movie, but it's one based on an idea, which is, — you probably know — is the most resilient parasite. But Nolan's idea for "Inception" wasn't a high-concept, poster-ready elevator pitch. To try to tell someone what "Inception" is about neither does justice to the plot nor really let that person know what "Inception" is about.