Space? We live in 3D space. Our brain is trained the way we can’t even directly imagine 4D space. The same way we dream. We don’t have so much scientific stuffs about human dreaming. It must be very creative, as the movie did, what if we will be in dream inside a dream inside another dream, multi-level dreams. What if we could control our dreams? What if this whole life is a dream and when we die we eventually wake up from dreams?
Such mind-twisting creative stuffs is the key-feature of this movie. You must be loving this movie, especially wonderful performance of Lionardo Dicaprio as well.