This is a link to Keith Armstrong's site and his page on Intimate Transactions, a multi-user interactive work. There is a very good video there explaining the multiple dimensions of the work and its process of development.
I was involved in designing and developing the haptic feedback system for this project (shown in images below), with Inger Mewburn. We did this collaboration back in 2004. Since then the interactive has travelled the world extensively, with significant acclaim thanks to Keith's excellent direction of the overall project.
Detailed discussions about our role in this project, and what we learnt from it can be found in two places:
1. My doctorate, The Aesthetics of Emergence, see 'Vibrating Bodies': pp. 240-268.
2. Ednie-Brown, Pia and Mewburn, Inger, (2006) ‘Laughter and The Undeniable Difference Between Us’, in Hamilton, Jillian (Ed.) Intimate Transactions: Art, Exhibition and Interaction within Distributed Network Environments, Australian Centre for Interaction Design, Queensland University of Technology.