Inception(Movie) : An Intellectually Stimulating Experience

I am short of vocabulary to praise this mind twister movie 'Inception'.I was wondering and thinking plethora of things after watching this masterpiece. Storyline ,narration,direction are all flawless and superb but what was intriguing me most how it actually engaged the viewers to stay involved,think and undergo an experience similar to the characters.
Inception deals with the concept of placing a thought in a person's head with several levels of redirection. The planting of the idea must not be explicit but should appear as if the idea formed as a result of the person's experiences. These experiences happen in a dream. The plot is so complicated and goes to and extends to several layers.How the writer can think of the idea,bring forth and make a masterpiece is something I am pondering over.Hats off for such creative,intellectual stimulating work!