Nikon 135mm f/2.8 with a reversed 24mm f/2.8 of a tightly grouped bunch of neck chain beads. Each bead is about 2mm in diameter. I also used one M2 tube between front elements of the 2 lenses. Used 2 macro ring flashes triggered by the D300 as controller.
For submission, merely re-sized the image and saved it for the web.
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Definitely some metal balls linked together, but what they are forming is a mystery to me.
Added: I'm going to guess that this is just a metal chain, of the common type you might use to hang something around your neck, or is often used as a pull chain.