Because color can differ wildly from one monitor to another, many designers and publishers rely on proprietary colorimeters to calibrate their displays. Software developer and electrical engineer Richard Hughes has been working on his own open source colorimeter he calls ColorHug. Along with the Linux software (also open source), it takes about a minute for ColorHug to take several hundred measurements and create an ICC color profile, which can be read by other operating systems. Richard is now taking advanced orders on the initial production run of about 50 units. What proprietary hardware realm do you think open source hardware will disrupt next?