The metro, subway, "mass rapid transit" or "em-er-ti", is not just a set of signals, but itself a signal left by the 19th and 20th centuries to our urban culture. Work developed during the Quinzena d'Art de Montesquiu QUAM 1997. Inspired in "Agents Infiltrats" workshops led by Toni Serra. Finished during art residency 1998 in HANGAR sponsored by QUAM. Created using the multimedia software Director 5.