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Swivelling Floating Eye

 neutral-buoancy eye being directed via 3D magnetic field.
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... 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

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       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.   


 

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