Progress and harmony of mankind

Takeshi Otaka's 1965 logo for Osaka's Expo '70.

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In 1965 the committee of the Japan World Exposition Association began its work to select the theme for the Osaka Expo, due to take place between March 15 and September 13, 1970. Following a series of meetings, the theme of this 1960s Expo was selected to be "Progress and Harmony of Mankind”, and a competition was initiated to solicit designs for the official Expo symbol from graphic designers throughout the country.