Do you spend too much time on you computer? You need a Personal Energy Orb, a glowing Arduino powered ball that allows you to trade physical exertion for a tolerable mouse speed. Developed by two students at the University of Munich for a physical computing course, the PEO connects to a bike-mounted revolution counter to note how far a user rides, counting the total distance toward usable time on a computer. A fully “charged” green orb will allow a user to use their PC unhindered — but a spent red orb will drag Windows’ cursor sensitivity settings to its lowest. The idea, the project’s creators say, is to annoy the user off of the computer and back on to their bike. It sure sounds annoying to me.

http://sketchingwithhardware.wordpress.com/2012/08/19/peo-personal-energy-orb/