I would guess that wheel is used to control the machine.
There's a wooden platform up there.
Before moving
If I'm not mistaken, the waterwheel is connected to more gears. It could be what powered this city, back when it was inhabited.
After moving
Those glowing signs look like they're etched right into the rock.
Before touching
It's locked from the outside.
First
It doesn't look very solid.
Second
Um, hello?
Hello
That woman looks like she belongs in the middle ages or something.
Before
It's Benrime, the innkeeper.
After
What a strange creature! I've never seen anything like it, not even in the bioneering labs back home.
Examine
Activate staff
Activate hands
Do water rippels
Switch light
Do
Fly camera
Typically 'break egg'
Set campathpos
Start movie
Pause movie
Continue movie
Stop movie