Circular step/cyclic-position indicator modelled on a decatron cold-cathode counting tube: a glow spot steps around ten radial stations, stretching onto an interleaved guide electrode before snapping fully onto the next cathode, free-running as an unbounded decade counter.
npx shadcn@latest add https://design.helpmarq.com/r/decatron-step-ring.jsondecatron-step-ring