Computers now outnumber people throughout the world. But less than one per cent of these machines take the form of desktop or laptop computers. As microchips get smaller and faster, they are being built into a huge range of objects and devices, including such everyday items as washing machines, toys and even clothing. People interact with dozens if not hundreds of computers on a daily basis, often without even realising it. But very few of these have mice and keyboards. As computers become more widespread, new ways of communicating with them are needed.