One point perspective is so named because it uses a single vanishing point to draw an object. Used here to draw a box, it is the simplest form of perspective drawing.

In one point perspective, the front and back transversal planes of the box always remain parallel to the picture plane. Only their scale changes as they recede into the distance.

Note that it is only the receding orthogonal lines which change their angles.

If you mouse over the image to view the completed illustration, you will notice that the front and back planes of our box have been left unfilled to make its construction more visible.