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For those who found Allan's explanation a bit brief, I prepared an expanded explanation, with diagrams.
There are three parts to making a perspective view: the object (e.g. the box that Ken asked about), the drawing plane (the 2-dimensional representation as it would appear on your drawing), and the viewpoint (your eye position). You chose the positions of the drawing plane and the viewpoint to suit your artistic requirements.
Imagine that you carry around a large piece of glass. You set it up between yourself and your subject, and, holding your eye still, you trace on the glass what you see. The result is a perspective view.
To create the same view analytically, you would draw views of the side and top (to scale, not in perspective). Draw lines from the corners to the viewpoint. The place where the lines cross the drawing plane is the position of the corner in the drawing, the vertical position in the side view, and the horizontal position in the top view. You can put these together either graphically or by measurement to locate the corner on your drawing.
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