Book Object is an international initiative in its fourth edition dedicated to the artist's book and design book. Conceived in 2016 by Susanna Vallebona on the occasion of the 21st Milan Triennale, it compares the world of art and the design. This edition took place in two locations: from 14 to 26 September 2021 at the new ADI Design Museum - Compasso d'Oro from 1 December 2021 to 12 January 2022 at the Braidense National Library, both in Milan. Exhibition, catalog and poster are in Augmented Reality. Thanks to the free app "Aria the AR Platform" it's possible to enjoy more than 100 videos