To the film Christopher Nolan, as well as to any quality puzzle, there are many approaches. You can, for example, perceive "Inception" as an action-thriller with cute special effects. We can consider Christopher Nolan as a family drama. You can finally work out a purely scientific, mathematical approach, look for shortcomings and blunders of authors. Here it must be said that the design invented by Christopher Nolan is almost flawless. It's not even that he figured it out (although in this too - after all, over the script he worked almost a decade). And the fact that Christopher Nolan does not explain which of the many layers of the film is a reality. So it's just senseless to find fault - the author will wink and say that dreams do not have flawless logic.
In any case, on "Inception", as well as on the cube Rubik, it is quite possible to get hooked. Unfortunately, such fascinating puzzles do not appear as often as we would like, but then they take months to build, if not years.