Das Kombinat created a sitespecific interactive installation for a beton silo of an abondend concrete factory in Alsen nearby Hamburg, Germany. Hörbar organized an event on the whole area and on that date Das Kombinat showed irp (Impulse Response Project), which resonates the concrete structure with impulses those frequency is influenced by the audience, pretty much like a Theremin.
Video below was harvested from the original Rich Video (those were the days) file which was on block4.com for a couple of years.
We managed to reactivate with the help of three.js the VRML Malte Steiner created to visualize the concept in 2000, the last VRML he did. To view it you need Javascript activated. Media archaeology at best.