The 23rd International Exhibition is conceived as a space for open and plural debate and comparison, where different experiences, cultures and perspectives can converge. Unknown Unknowns. An Introduction to Mysteries tries to answer a series of questions about what we still "don't know we don't know" in different topics: from the evolution of the cities to the oceans, from genetics to astrophysics. A deep experience, which involves designers, architects, artists, playwrights and musicians, and that gives the opportunity to overturn our idea of ​​the world.