To facilitate the added functionality, the prototype cables are packed full of more than just wires. There's also piezo copolymer cables hidden away inside which are able to generate currents and signals as the cables are pinched, which are then translated into commands. So in their current form the Cord UIs cables are a little on the chunky side. But even if there's no room to streamline their design, the added functionality of using your entire headphone cord as a remote sounds like it would totally be worth the extra thickness. [Cord UIs via PSFK]