THE T TERM LETTER IS BEAUTIFUL IN ITS POLYSEMY: IT CAN SER USED TO DESIGNATE AN EPISTOLARY DOCUMENT, A NAVIGATIONAL CARTOGRAPHY OR A SHUFFLE CARD IN RANDOM ORDER ALONG WITH OTHER SIMILAR PIECES IN VARIOUS GAMES OF DIFFERENCE AND REPETITION. LAS LETTERS TO LAS THAT THE T OF ESTE BOOK ALLUDES TO ARE ELEVEN EXERCISES OF THE POSTAL GENRE THAT JUAN LUIS TRILLO DE LEYVA WAS SENDING TO A SMALL GROUP OF FRIENDLY RECIPIENTS BETWEEN FEBRUARY AND APRIL 2016,