Ubiquitous 10 Feb 2009 The sets would be powered by the viewer's body heat, according to Ian Pearson, a so-called "futurologist" who has advised leading companies including BT on new technologies. Mr Pearson told the Daily Mail he believed that channels could be changed by voice command or via a wave of the hand. Meanwhile "emotional viewing" could be another development in television technology, according to a report commissioned by the technology retailer Comet. A "digital tattoo" fitted to the viewer would pick up on the feelings of characters on screen and create impulses causing them to feel the same way. The development could see James Bond fans become able feel the thrill of a high-speed car chase or sports fans allowed to share the joy of elated players, it said. "We could even get to the point where we'll be able to immerse ourselves in a football game, making it feel like you're running alongside your favourite player or berating the ref," the report added. Miriam Rayman, of the Future Laboratory consultancy, which compiled the report, said the basic technology needed for the developments already existed. She said: "The technology is getting smaller and smaller and people are trying to work out how to make it more immersible. They are trying to bring it closer and closer to the eye."