I saw an interesting sculpture in this gallery by a guy called Russel West. It was as follows:
Thousands and thousands of keys had been fixed pointing outwards on a wireframe in the shape of a long cylinder. The appearance was as of a dense coat of metal scales on a serpent, which was accentuated by the shape of the cylinder, curving like the shape a snake makes with it crawls along. However, the curves were quite regular, like a sine wave, and as I recall, the ends were un-tapered, so the idea of a snake may just be me.
Nevertheless, the idea of a snake of keys, a key snake, has half a dozen different interpretations. That one is making me think a bit.