I can imagine a sphere floating in a magnetic field as pendulum. Then 3 dimensions might be possible?
Didn't I see that in a sci-fi movie? Or perhaps on TV ("Alias" or "24"?)
Definitely from sci-fi
a quick google "gadget floating sphere magnetic" gave things like - Hacker Builds Floating Jedi-Training Remote Droid | WIRED
such a thing could become a nice EQ sensor 