the furniture and transportation and Kawazoe to curate the Mid-Air Exhibition which was sited in the huge space-frame roof. Tange envisioned that the Expo should be primarily conceived as a big festival where human beings could meet. Central to the site he placed the Festival Plaza onto which were connected a number of themed displays, all of which were united under one huge roof. In his Tokyo Bay Project Tange spoke about the living body having two types of information transmission systems: fluid and electronic. That project used the idea of a tree trunk and branches that would carry out those types of transmission in relation to the city. Kawazoe likened the space frame roof of the Festival Plaza to the electronic transmission system and the aerial-themed displays that plugged into it to the hormonal system. Kawazoe, Maki and Kurokawa had invited a selection of world architects to design displays for the Mid-Air Exhibition that was to be incorporated within the roof. The architects included Moshe Safdie, Yona Friedman, Hans Hollein and Giancarlo De Carlo. Although Tange was obsessed with the theory of flexibility that the space framed provide he did concede that in reality it was not so practical for the actual fixing of the displays. The roof itself was designed by Koji Kamaya and Mamoru Kawaguchi who conceived it as a huge space frame. Kawaguchi invented a welding-free ball joint to safely distribute the load and worked out a method of assembling the frame on the ground before raising it using jacks. Kikutake's Expo Tower was situated on the highest hill in the grounds and acted as a landmark for visitors. It was built of a vertical ball and joint space onto which was attached a series of cabins. The design was to have been a blueprint for flexible vertical living based upon a 360m3 standard construction cabin clad with a membrane of cast aluminium and glass that could be flexibly arranged anywhere on the tower. This was demonstrated with a variety of cabins that were observation platforms and VIP rooms and one cabin at ground level that became an information booth. Kurokawa had won commissions for two corporate pavilions: the Takara Beautillion and the Toshiba IHI pavilion. The former of these was composed of capsules plugged onto six point frames and was assembled in just six days; the latter was a space frame composed of tetrahedron modules,