Without the option to manufacture wind (behave) you have to find other ways to make the windmills turn and thereby make the world work once more. The design you've engineered is a complex system of underground cogs.
It's your job to fit those cogs neatly together thus allowing the windmills to run. You have a selection of cogs and a selection of pins on which to hang them. You'll encounter special cogs and pins as you progress through this engineering game. Further testing your abilities!