The C-theory of time asks if time really has a direction.

With time flipped, we see a world in which shards of glass spontaneously jump off the floor into smooth wineglasses, cars suck carbon dioxide out of the air while moving backwards, and the surface of each Phil Collins LP is slowly smoothed out until no record of his music remains. As desirable as each of these processes might be, they appear not to describe the world in which we live.