208
The two events are well documented in the sense that the proceedings were made available based on the audio material (Riemens 1989, Riper et al. 1990). Paradiso and Hack-Tic published the first edition of the proceedings of the GHP in 1989. Village Design Inc. in San Francisco (USA) published the second edition of these proceedings, also in 1989 (Riemens 1989). An impression of the Seropositive Ball was published by the Centre for Innovation and Cooperative Technology at the University of Amsterdam (Riper et al 1990).