About 20% of all the world's aquariums are found in Japan. Many feature unique specialties, from jellyfish to frozen river scenery. Others borrow techniques from Japanese garden design. This time on Japanology Plus, our theme is aquariums. Our main guest is Hajime Nakamura, an "aquarium producer" who explains why these aquatic utopias are so enduringly popular. And in Plus One, Matt Alt goes behind the scenes at the Sumida Aquarium at Tokyo Skytree Town.