Virtual Concrete is one of the first interactive installations that combines the physical space with the Internet that was a response to the so much talk separating these spaces. My intent was to create a piece that connects the virtual and the concrete, and I searched for a definition of habeas corpus that was philosophical key to the debate about cyberspace and censorship. Habeas corpus signifies the need for physical evidence in order to have a case; when activities are transferred into an intangible realm, the ground becomes shaky. The installation consisted of six 3-ft slabs of concrete covered with large electrostatic (digital output) prints, along with light sensors and a computer connected to the Internet via a CU-SeeMe camera. On the Internet, I established a Virtual Concrete website to allow viewers from around the world to see the visitors/participants who walked on the concrete.