The skin of a _____?
We found it on the Boundary Bay beach, just below the high tide line. Does that help?
How about if I step back a bit?
That should be pretty obvious.
It's art by Ol' Ma Nature, working in mixed media: black rot fungus, some of that green slime that grows on any wet wood around here in the winter, sun and salt bleached wood, in collaboration with a crew of chomping critters.
Here's the context:
Old driftwood, root end.