Taro Okamoto is one of the most important Japanese artists of the 20th century. Most of his works can be enjoyed in Japanese museums and also in open spaces, like for example The Tower of the Sun, built in Osaka as the symbol of Expo ’70. The Myth of Tomorrow (Asu no shinwa – 明日の神話) is one of his most important works; it represents the explosion of the atomic bomb in Hiroshima. It is a big painting, measuring 30 meters long, but for some strange reason it got lost for more than 25 years. Eventually someone found it in a warehouse and it has finally been exposed in Shibuya station since the end of 2008.
You can see it at Shibuya station in the hallway that goes from the JR lines area to the Inokashira lines area: