Bruce Hainley in conversation with American author Wayne Koestenbaum about the muteness of Harpo Marx. Michele d'Aurizio on the Villa Necchi Campiglio, one of the most unusual private houses in Milan. Philippe Pirotte on the Centre for Contemporary Art in Lagos. We visit Tbilisi in Georgia, a city that is currently creating new structures for art. With portraits of Anri Sala and Keren Cytter.