On October 6, 7, and 8, 2017, the A Cel Obert festival of ephemeral interventions took place in Tortosa, centered around the leitmotif perspective. The Xarxa Transversal d’Activitats Culturals invited the AiEM group to participate with an installation for the courtyard of Palau Despuig. The intervention, named Crescendo, visually modified the length of the staircase located in the courtyard, creating the illusion of a longer staircase.