These are Cog and Gear infested maps.  The cogs can be moving quickly, slowly, or not at all.  Rapidly spinning gears force a skill check/skill challenge to move and fight upon.  Slowly moving gears may mean that walkers can cross from gear to gear at certain times each day.  Frozen gears may mean the the machine is broken or inactive.  The device may be an ancient relic of world genesis, a doomsday device, or the invention of a fevered genius or mechanical cult.

The Gearwright Isles
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