I related Calvino’s exactitude to time and motion in graphic design. This may seem like a bit of a stretch, but I see a connection between exactitude and animation in Soundpoems. Lupton and Phillips say that “Film is a visual art. Designers of motion graphics must think both like painters and typographers and like animators and filmmakers.”
Furthermore, they state that “animation uses sequences of still images to create the optical illusion of movement. The brain retains images for a split-second longer than the images are actually before us, resulting in the illusion of movement when numerous images appear in rapid succession. This phenomenon is called persistence of vision.”
This relates to exactitude because a work of literature, like a book or a film, is composed of smaller elements, like letters or frames, carefully arranged to produce exactly the right kind of effect. Creating such a work of art takes a great deal of finesse and attention to detail, which Calvino would call exactitude.