spoiler alert below, DO NOT READ IF YOU HAVE NOT WATCHED THE MOVIE
i think the whole mission and everything involved with the entire movie was just to incept the thought in leo's he got home with his kids. thats why at the end you didnt see the peice topple over. but the best thing about this movie is it's open to interpretation. it could be any amounts of different thing and you wouldnt be wrong. this movie is a mindfuck and no other movie has really ever pulled anything like this yet.