One wonders how something like this gets lost or discarded. I probably should have photographed it in place to document the circumstances of its discovery. Instead I took it home thinking I might frame it and hang it on the wall.
I tried scanning the piece, but result was very dull; it needed to be lighted obliquely in order to properly illuminate the polished surfaces. I then photographed it with my digital camera against a white background in subdued window light.
A shot of the back of the mosaic reveals something of its origin.
(This post was originally on my digital/political blog which I or anyone else seldom visit.)