Alice describes the special effects necessary to make a bodiless head.

When the Borg Queen first appears, we see her snake-like independent head lowered from the ceiling. It�s very cool - but how was it done?

What they did was that they used a motor control camera head. I was put in a little cradle that was lashed to a crane and I was horizontal and they had stuck the prosthetic neck and that metallic spine to me here. So I was horizontal and the neck hung down.

They took me thirty feet up in the air and they brought me down slowly on a path that we had arrived at in rehearsal and deposited me on a little X. And then, having filmed that with the motion control camera head, they removed the crane. Then they married those two images together in the computer. And likewise for the moment where her head locks into her torso and she walks over to Data.