With Coop Himmelb(l)au I (re)discovered a connection between them and Abe Hitoshi, as the latter was project manager for the Osaka FOLLY #6 FOR EXPO'90 by Coop Himmelb(l)au, which in turn sheds a (re)new(ed) light on the "Educating the International Architect" symposium at University of Tokyo in summer 2009, where Abe as well as Wolf D.Prix attended. The next surprise was the EXPO'90 exhibition itself, as some other international and well-known architects contributed folly designs. Also in 2009 I saw an exhibition about Coop Himmelb(l)au's recent work at the NTT ICC in Tokyo, which, had I known that he had built already in Japan, I might have searched for other connections with Tokyo.
A quote from Wolf D.Prix (1968) "Coop Himmelb(l)au is not a color but an idea, of creating architecture with fantasy, as buoyant and vibrant as clouds." This vision, perhaps, is fuelled by the start of the space age in the 1960's, as an elevated, earth-free environment.
Here it's interesting to note, that recently in 2011 Fujimoto Sou spoke of architecture as (forest,) cloud (, mountain): "Forest-like architecture may be something between artificial and natural; perhaps when we speak about a cloud-like architecture, we could imagine architecture made up of air and light rather than a wall. Mountain-like architecture may dial up a new relationship between the human body and the building." His attitude, perhaps (again), might be strongly influenced by his own time, responsible for and dependent on planet earth and mother nature, shaping the earth-bound environment.