Linear Creature

Most creatures in this universe are born to traverse the three dimensions of space freely, so long as they are left justly unrestricted. The fourth dimension, time, has however proven itself more challenging to navigate, and most creatures can only pass through it in one direction, at a constant pace. Imagine for a second that the temporal planes of years and hours lent themselves to free movement as readily as the physical realms of land and water. You cannot. Alas, we are but linear creatures