The Osaka Expo was the peak in a tendency that could be observed since the 1930s - instead of focusing on country-specific and fact-based expositions, many countries chose rather abstract themes which aimed on establishing a "corporate image" through artistic means and "infotainment" presentations. In many cases, the connection between the representation and the respective country was rather far-fetched and transmitted through sound shows or movies, a rather new approach (for more information, I recommend this very interesting essay by Paul Sigel - in German only).