Flattenable hook! Why didn't I come up with that idea? Roll it back and forth, it expands, it contracts, 2D, 3D, back and forth. You need a hook? You don't need a hook? You need a hook? No, you don't? Why have nasty things poking out from the wall to bother you when you don't need one. You need a hook, you extend, you don't need a hook you flatten. Good exercise! Genius solution, patent it!