For the Urban Explorers festival http://www.hypernarrative.com and I made an installation using the Roomware server. As soon as the server detects a new bluetooth device in the room a new character shows up on the screen. When the server no longer detects this person (because he or she is to the bathroom) the character disappears from the screen.
Wonderfull Installation by Wilbert Baan - hypernarrative.com
Animations are made by Ronnie Deelen - ronnieism.com
Open Source software by Roomware - roomwareproject.org
Video recorded at the Urban Explorers festival 2009, May, Dordrecht, Netherlands.