This graph is analogical to movement in the universe. It is in fact the graph of the reciprocal of the hyperbolic tan function. What I wanted to demonstrate was the seemingly impossible nature of the graph switching from a value of infinity to negative infinity across the line x=0. I think that when we do discover the exact nature of space in the universe it will be dependent on a curved model in so that the three dimensional plane of space will fold back in on itself, metaphorically speaking, like a sphere so that anyone attempting to reach the edge of the universe will find it is in fact impossible.
