‘”Feel this progression further and further back in time” – Christopher Nolan
It’s really interesting how Nolan’s idea to tell a story from ending to beginning,
The objective perspective of the movie and the subjective perspective, the forwards narrative and the backwards narrative meet to end or conclude the movie or chronologically technically the middle of the movie.
Colour sequences are subjective as the audience is in the protagonists head all the time, knowing what is going on. Black and white sequences are objective the audience is not in the protagonists head, obscuring the view of the audience visually and mentally creating mystery, a puzzle, a conundrum.
Harry Twyman Art & Graphic Design Blog 