London, Jul 18 (IANS): Actor Leonardo DiCaprio is all praises for his director Christopher Nolan's "highly ambitious" new movie "Inception".

"It's a highly ambitious film and it works on four different states of the subconscious mind. It's like a domino with each one affecting the other," contactmusic.com quoted him as saying.

The 35-year-old actor plays the leader of a gang of dream thieves in Nolan's latest film. He loves the ideas behind the sci-fi movie and thinks the clever plot will give audiences something to reflect on afterwards.

"It's Chris Nolan delving into dream psychoanalysis and also making a high-octane, action-filled, surreal film," he said.

The "Shutter Island" star also said filming the movie required a lot of "detective work" as he had no idea what it was actually about.

"Chris wrote the entire thing and it all made sense to him, although it didn't make much sense to us when we were doing it.

"We had to do a ton of detective work to try to figure out what the movie was all about and what we were doing from day to day," he added.