Chronos Chromos Concrete, a project by Chris Glaister, Afshin Mehin and Tomas Rosen at the RCA Innovation Unit (London), uses heating elements and ink to allow graphics, words and numbers to be displayed within concrete.
Thermochromic ink is mixed with concrete. Then, nickel chromium wires, which heat up when electric current is passed through them, are set beneath the concrete surface. The concrete thus changes colour when a certain temperature is reached. The arrangement of these wires beneath the concrete allows the display of graphics and information.
Related: light transmitting concrete.