The appearance of the wheels and their work was like unto the colour of a beryl, and they four had one likeness,and their appearance and their work was as it were a wheel in the middle of a wheel.
Law is what makes sense.
Mechanus is a dimension where the living and the dead dwell together, focused on Law. All creatures hear all speech and see all writing in their own language, and can survive in any environment. The whole is constructed of enormous interlocking gears. Don't expect to find unselfish love here. The locals, especially the dead, are literal-minded and mostly humorless.