Your hands know a lot.
They know how to handle things. They sense what needs to be done.
If you let them pick up a stone and give them enough time, they'll figure out where it goes.
They can feel the stone's shape and then tell the eyes where to look where it will fit.
Given practice they can grasp things in the physical world that the brain still hasn't figured out, like how to build a damn good wall without worrying what anybody else 'thinks'.