when it rains, it pours

The current batch of perspectivists at UC Extension recently reverse-engineered some photos. Reverse engineering is the process of analyzing a subject system to create representations of the system at a higher level of abstraction. A photograph is a representation of the system of perspective construction. The camera uses a station point, line of sight and picture plane; it has a field of view and focuses along a line of sight. These geometric abstractions are common to both perspective and still photography. Our perspectivists located abstract components in the photographs and roughly sketched out plan versions of the scene the camera most likely faced.
Google SketchUp simulates the same kind of reverse engineering on photos to get them to merge their represented reality into the virtual reality of SketchUp. The programmers then had to find a way to make visible the abstract components WITHIN its 3D modeling software, since the software itself, being no more like sight than photography, is a representation of the system of perspective drawing. Looks a lot like the perspectivists' work!The whole process reminds me of staring at the rainy-day illustration on the Morton Salt container. A girl was holding an umbrella and a container of Morton Salt, which had the same illustration with a smaller girl, smaller container, with yet another illustration of a girl with an umbrella and an illustrated container. Or so I imagined.