This video demonstrates how to create a one point perspective drawing. You begin by making a horizon line across your paper and adding diagonal lines from the corners which will all converge at a single point along your horizon line. You can then create boxes by creating squares or rectangles around the lines extending from the central point. The outer edges of your rectangle can further be connected to your single point in order to create a 3-dimensional shape for the boxes and cubes which you are drawing in your picture. This method can be repeated throughout your drawing in order to create a one point perspective picture with boxes extending from a central point.