Interesting.

The "dream" part of this is at least twofold, it seems to me. First, of course, the notion that privacy could possibly be preserved in the face of the widespread implementation of this technology. Second is that of the cheap recovery of materials. Apart from the presumable uninterest on the part of manufacturers to re-acquire spent goods for this purpose, as well as the probable high cost of this means of recovery -- individual returns to individual manufacturers in a very different line of business than the production of raw materials -- it is likely that products age not only due to stress and wear, but to changes in chemical composition. I would, however, be very glad to know where my glasses have got to.