Basically, physics. It's a seesaw. One side balances the other out. That's why there's always something that looks like a big cement block. It's what balances the load out.
Well, many cranes unfold and then are set up, hope this may help some of you in your future endeavours, like If someone kidnaps you, holds a gun to your head and says they will only let you go if you tell to them the way in which cranes are often set up
Guys I think I was lied to