Imagine yourself in a fast moving train going from point A to point B. Now let us suppose that A is the Past and B is the Future. So you can sit by the window and you see the landscape passing. The landscape stretches from the right to the left. Now draw a vertical line across the window. What lies on the right side (right coming direction) is the Future, but what is on the left – the Past. The train is moving very fast and you are trying to fix the Present behind the line. You cannot succeed because of the flashing real from the right to the left. The train’s speed is the speed of Time.