Draw One-Point Perspective

Here's a photograph of a box on a table. The line across the back is not the horizon line - it's the edge of the table, and is lower than my eye level, and so, lower than the horizon. If we continue the lines made by the edges of the box, they meet at a point above the table - at eye level. If we could see into the distance, it would be on the horizon, (provided the camera is looking straight ahead, and not tilted). The front edges of the box are quite parallel.