The Tower, named after the card in the major arcana of Tarot... it is the biggest creature among the machines, it's industrial body towers above buildings. It is said it once had a mind, but slowly it's own hunger drove it insane. Eternally hungry it devours almost everything in sight, whether it be metal stone or plant/animal matter. It must continually eat to fuel itself... it has even been known to eat it's fellow machines.
To give you an idea of how huge it really is...
A city bus is = to the length of his head from top to chin (while mouth is open)
A human being is almost, not quite, the size of one of his teeth
9 and his friends are about as tall as a human head.. but not quite.
9 is a gnat to The Tower.