However, we still expect that light's entropy must somehow be conserved, if it is indeed connected to the first law, as we have supposed. When light is converted to matter, light's intrinsic motion disappears, but matter acquires a strange, new intrinsic motion, gravitation. Indeed, it is so. As in the case of light's intrinsic motion and space, matter's gravitation creates a dimensional conservation domain, time, appropriate to its energy source. Also like space and light, the time dimension shares the intrinsic motion and entropy of its energy source, gravitation.
Gravitation is the force which creates matter's time dimension by consuming space.
The gravitational substitution of time for space directly embeds matter in the metric, from which it would otherwise be estranged due to its lack of intrinsic motion. Massive objects have intrinsic motion in time not because they move, but because the dimension moves. Recall that it is possible to move in one dimension of space while remaining stationary in the other two - this is the typical case for linear motion. Since time must be thought of as existing at right angles to all three spatial dimensions simultaneously, it is not difficult to see how objects can always be moving in time whether or not they move in space. The gravitational field of mass connects space and time, creating time by the consumption of space.