I'm hoping someone is willing to help me with this question. Time is well explained when observed at point between absolute rest and c. The faster an object travels through the dimension of space, the slower that object travels through the dimension of time. Fair enough. Does this mean that the dimension of time only pops into existence when an objects that has mass moves at a rate somewhere between absolute rest and c? Is the dimension of time "absent" at both extremes (absolute rest and c)?