Tokyo Skytree, completed this year, rises 634 meters. The world's tallest broadcasting tower, it's packed with the finest in Japanese engineering. Its steel framework was assembled with millimeter precision from sections lifted to dizzying heights. Special construction methods were needed to cope with the wind. And Japan is an earthquake-prone country, so Skytree has the latest seismic defenses, including one inspired by pagodas. The construction company that built Skytree commissioned an architectural photographer to record the building process. He was the only photographer permitted on the construction site, and the 40,000 photographs he took are an epic chronicle of this once-in-a-lifetime building project. Tokyo Skytree sits in an old-fashioned part of Tokyo with a tradition of small manufacturing enterprises. But now, an entirely new venture is emerging. On this edition of BEGIN Japanology, our theme is Tokyo Skytree. This is part of our special Tokyo trilogy. We explore Skytree's cutting-edge technology and see what effect this new landmark has had on people's lives.

Potatoes, sweet potatoes, taros, yams - these are just some of Japan's imo, a word that describes starchy vegetables with enlarged underground roots and stems. Sweet potatoes saved countless lives during the great famines of the samurai era and the food shortages of the Second World War. Konjac is a food with a unique appeal. It has practically no nutrients or calories, and little flavor, but its unique texture is widely enjoyed in Japan. It also, believe it or not, played a role in a Japanese wartime plan to terrorize the United States with fire balloons. Japanese mountain yams are prized for their viscous texture, and some people trek through the woods in search of the very largest ones. On this edition of BEGIN Japanology, our theme is potatoes, taros, and yams. By exploring this wide variety of tubers, we will dig deep into a rich Japanese culinary tradition.