... Sadly i have not yet thought of an outside-Halloween application to this...
An eyeball is suspended in a clear fluid. inside the eye is a magnet. Around the vat holding the fluid are 3 pairs of coils, able to generate magnetic fields perpendicular to each other (3 Helmholtz coils, in effect). The desired gaze direction is produced by the right combination of field-vectors.-- loonquawl, May 18 2009 You are right - the switching of the field necessary for levitation could also power some appliance inside the eye ... true 360°x360° tilt/pan webcam?-- loonquawl, May 18 2009 Good eye mate.-- 2 fries shy of a happy meal, May 18 2009 random, halfbakery