I experimented in the former „Kunsthaus Tacheles“ in 2010 based on a speakers cone.
I photographed the projection of mixed materials in water with an overhead projector and assembled them into a video. No postproduction. 2009
More info at digital/projection.
I made these lights, from old window frames I found on the streets of Berlin, and secondhand 12V power adapters, cables and rainbow 4mm LEDs in the former Kunsthaus Tacheles in 2010.