The population reached ten million in 1964 as the Summer Olympic Games that year left a deep impact on the national identity of Japan. The nation's wounded psyche and reputation from World War II was significantly healed. Rapid social changes, thematically staged in the Olympic ceremonies, enabled Japan to display an inclusive and comprehensive national pride, and underscored Japan's re-entry into the circle of developed industrial countries. The 1964 ancient arts exhibition put on by the Tokyo National Museum to coincide with the Tokyo Olympics provided an opportunity to promote Japan's traditional culture to foreign visitors and to the Japanese people themselves, as part of an effort to regain normalized status in the international community. Architect Kenzō Tange is most famous for the Yoyogi National Gymnasium, built in 1964 for the Olympics.