### The métro formula

The book covers had been on sale for a year and I had never taken the time to try them *in situ*. That's when I had the idea to test the book-covers on the passengers, and by the same occasion to ride every Parisian metro lines. From the inside, I was an A.O.S (an Ad On Site), from the outside, I was the ball pen that would scribble in black the colored metro map.

While I was in the metro, calculating the average time spent during the connections and adding it to the average time spent waiting for the first train to arrive, I found this formula. It was the concrete result of a rather vain action.

Since 2004, I've been placing this formula, these small yellow paper rectangles, on the seats of the métro platforms, as discreetly as I could. Even if I don't take the métro everyday, that's quite an amount of formulas.