Tadao Ando’s studio took a 20-year-old Seto Inland Sea passenger ferry and rebuilt it into a floating library, then donated it to Kagawa prefecture. The 20-metre boat carries 2,000 books to remote islands on a rotating schedule — twelve aboard at a time, free, though most calls are closed school trips and public sailings are balloted — with reading spots tucked into the cabin, a second-floor observation deck, and a wide circular bench on the stern where kids can read stretched out in the sun.