Using pressure-sensitive ink and printed speakers, new "talking paper" is essentially an interactive billboard. "When you approach the billboard and put your hand on a postcard that shows a picture of a beach, you can hear a very brief description of that beach," suggests project lead Mikael Gulliksson. The electronics are sandwiched between a heavy-duty cardboard backing and the decorative front layer, so it's not precisely the flimsy thin stuff we think of as paper, but ...