It appears in many discussions prior to what we know as modern plastic. I've been doing some word searches trying to get my brain around what someone like Alfred Stieglitz would have meant in 1905 if he had used that term in regard to a photograph. Lens manufacturers refer to it, and indeed bringing it right into current times, our beloved Plasmats use the root of plastic to describe what their original manufacturer thought his lenses produced. Is it simply the idea of a photograph that leaves the single dimension flat world and brings a 3 dimensionality like a molded statue? What think ye?