Spending too much time indoors? 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 aggravating to us. Check out the full homework assignment at the source link below, complete with goals, follies and Python scripts.