Koru Fine Coil Metal Sign

About the Fine Coil design

A lone white channel spirals into a solid black disc, starting as a hairline sliver near the upper right rim. It sweeps counterclockwise around the edge, thickening steadily until it is at its broadest along the lower left, then tightens into a second, smaller turn. At the center the black steel forms a little hooked knob, like the curled tip of a fern frond, which the white band wraps around before running out.