The Metro is a long, winding underground ribbon that snakes around the city, like a wispy thread of Ariane on wheels, carrying millions of individuals. The metro is a natural barometer of what’s happening on the street. It is a journey without an end. A place where all people without distinction, the poor and the rich, the doctor and the sick, the employee and the laborer, the commuter and the tourist, he who eats three times a day and he who eats every three days, meet and walk by each other several times a day, they brush past each other, sometimes talk to each other, sometimes say hello, sometimes recognize each other, other times ignore each other, run into each other, smell each other, like each other or disgust each other, fall in love each over or break away from each other. In this place where some are born and some die, some laugh while some cry, some play an instrument and others sleep. Here, life flows fast.