A gyroscope (approx. diameter: 1ft, weight 8lb, variable spinning speed) powered by small electric motor. The gyroscope would be mounted within a plastic shell with aerodynamic exterior, comfortable backing and shoulder straps (would resemble a back pack).-- xaviergisz, Mar 01 2004 Could it be hat-mounted?-- Monkfish, Mar 01 2004 <raises hand> I wanna be the tester for this.-- Letsbuildafort, Mar 02 2004 Based on the effect I've experienced just with a spinning bicycle wheel, I'm gonna guess that 8lbs might be excessive.-- half, Mar 02 2004 Would certainly help with your posture.-- Letsbuildafort, Mar 02 2004 random, halfbakery