Leonardo's pyramids

Within the book The Science of Leonardo by Fritjof Capra, there is a quote from Leonardo da Vinci that is visually interesting:

"All the things transmit to the eye their image by means of a pyramid of lines. By 'pyramid of lines' I mean those lines which, starting from the surface of each item, converge from a distance and meet in a single point...placed in the eye."

Here's a bit of conjecture on my mind. From Leonardo's intricate and complex drawings, we see he must have learned to visualize more than the images one sees ordinarily. He was able to keep aware of the invisible but real, physical paths between the objects and the eye. The 'pyramid' he describes is not visible to a second and third observer on either side of him. The travel or trails of the light are not usually visible to the eye in a lighted area, and they are not the same for each observer; their separate perspectives would create different pyramids.
 
Though the lines are not visible to the eye, Leonardo perceives them with intention. (Naturally, or did he train himself to do this, expand his mind?) Many of his artistic works and scientific sketches have a complex depth viewers have admired for centuries. His visualizing the invisible pyramid created from light flowing there to here adds dimension to his art. It seems he played with the multi-dimensional objects shaped by those trails of light, creating unusually vibrant representations of what he saw.