Labyrinth Spiral Core Metal Sign

About the Spiral Core design

Nested steel rings fill the disc, each one broken by short radial spurs that jog the lanes sideways from one circle to the next. The outer rim closes as an unbroken circle, with no gap at the edge marking a way in. At the center sits a small open loop with a hooked tail, like a letter C curling back on itself. Walls and lanes run at nearly the same heavy width all the way across.