Expo '70's Mushballoons

I'm fascinated by these structures that were in Expo '70's amusement zone, Expoland. The park lived on for decades after 1970 and I'd love to find out whatever became of these structures... and how well they survived in the elements.



The text accompanying the photos says:

"This is called the Mushballoon because it is shaped like a mushroom. The Mushballoons are the centerpiece of the Space of Planets in Expoland. They are elegant and dynamic in appearance.

The huge cushion of air is suspended by 45 strands of wire. The wires are all brought together and connected through a tube to a winch in the basement. When the winch is wound, the mushroom collapses in 15 minutes. The Mushballoons rest at night and bloom again in the morning. The diameter of one Mushballoon is 30 meters, that of another 20 meters, and that of the three others 15 meters.

Architectural Design: Taneo Oki Architects
Structural Design: Shigeru Aoki Research Office"

I found more information (including some cool diagrams) at:
http://www.tensinet.com/database/viewProject/3839.html

Expo 70

When I was much younger and first learning about the history of world's fairs, two really stood out among the rest for me.

Naturally, the 1939-'40 New York World's Fair had lots to interest a high school student interested in architecture and design. I'd still say, today, that if I could go back in time and visit any world's fair, it would be this one.

However, Expo 70 in Osaka is a really close second place. Later, in architecture school, I'd learn about the Japanese Metabolist movement in architecture and Kenzo Tange, the grandfather of modern architecture in Japan and the designer of the Expo 70 site.

Currently, the site is a park with some of the artifacts of the expo, particularly the enigmatic, iconic Tower of the Sun as well as the amusement zone, Expoland.