Here is another interesting thing.  If you pull the magnet up away from the base
it of course pulls the mesh up.
But if you push the magnet below the base it repells the mesh.
So instead of getting a bump on the box, you get a dimple.
I haven't seen that mentioned anywhere, but it would be great
if you wanted a character's finger to look like it was
pushing into something, just put a negative magnet
on the object the finger is pushing against.