matanuki

On April 16th, Northern Illinois University hosted an art exhibit called “Interreaction” in the Holmes Student Center Glass Gallery. The show was planned, organized, promoted, and featured work by undergraduate Time Arts students. The focus was interactive, installation-based work that balanced technology with artistic intent. We enjoyed high attendance and an overall positive response.

My piece, “Reflex,” was an interactive sculpture constructed out of nylon string, tape, and pellon fabric. The fabric is threaded through and suspended by a web of strings attached to the ceiling and floor. Each length of string was constructed in a fractal-like pattern: a length of 10-12 feet has offshoots at set distances, each of these 6-8 feet in length. Off of these branches are additional lengths of string, branching into 2 foot end segments.

Behind the structure is a computer, DLP projector, and a concealed webcam. A Flash/ActionScript application is projected onto the fabric and fed video data by the webcam. The Flash app populates a black screen with small, circular objects that drift around aimlessly. Every 50ms, the current frame of video is captured as bitmap data and applied as a difference filter to bitmap data of the previous frame, creating a two-color image map of motion in front of the camera. On each frame, the application iterates through the floating objects, and checks what color the image map is at this location. If motion is being recorded at the location of an object, it is sent flying away. When viewers walk past the installation, the objects ripple. If a viewer waves their hand around in front of it, the objects scatter and move away.

The result is an initially subtle level of interaction; many people would walk almost completely past the installation, then suddenly stop and do a double-take, wondering if the motion of the objects on the screen was tied to their movement or mere coincidence. This reaction contrasted sharply with the response later in the night, when the secret was out and viewers gathered to test the limits of the interaction.

If you have a webcam, you can view the Flash component of the project here. If you do not want the project to access your webcam when prompted, simply navigate away from the page. Clicking “Deny” may cause the plug-in to crash.

The installation shortly after it was set up:

Impromptu beard-off:

Photos courtesy of Adam Kohlhaas.