A Victorian-industrial gear train where meshed gears must rotate at speeds inversely proportional to their tooth count, and adjacent gears always spin in opposite directions, just like real mechanical gearing. Nine bronze/copper gears are procedurally extruded from 2D tooth-profile shapes (no external models), each fitted with instanced rivets, while a pooled sprite system emits and recycles up to 60 steam puffs from two vent pipes.