Anatomists also use dimensions in the naming of structures,the sternocleidomastoid muscle tells us its exact location. As I scribble these words, I am 30 meters above sea level, 0.37811 degrees longitude, 52.59840 degrees latitude. This information places me in three-dimensional space. By telling you it is 3pm on a sunny Thursday in May, I am giving you the dimension of time. Space and time are a coupled relationship that Einstein named spacetime. So, while the 4th dimension is said to be time it is therefore also space and, critically to us, the relationship of the two is one of movement. Neither space nor time, nor spacetime is a static entity.