Every Sunday, outside the market of Sant Antoni there was a secondhand book market. The holes on the piano roll for this piece originate from the imprints that the stands of the booksellers left on the soft targround of the sidewalk. The position of every hole in the ground in reference to each other and to the sidewalk as a whole was determined by the help of a measuring wheel, reduced to the scale of the player piano roll and perforated in the paper. (Barcelona, 2012)