A friend of mine went through this fifteen or so years ago, and the treatment worked like magic. I remember him marveling that it was a purely physical process

A friend of mine went through this fifteen or so years ago, and the treatment worked like magic. I remember him marveling that it was a purely physical process - like a certain kind of 3D puzzle, where you coax a marble through a maze, and then: ta-da, vertigo is gone!