Unterholz (‘undergrowth’) is an innovative audiovisual performance by German artist, composer and cellist Marcus Kaiser featuring members of the Free Range Orchestra. Based on an immersive projection of a camera moving slowly forward through jungle undergrowth, the piece overlays audio and video from past performances. This becomes a visual analogy for the exploratory, organic growth of a semi-improvised piece as it is performed repeatedly in different places, with different people and different durations, accumulating meaning and identity with each iteration. Unterholz has been performed 23 times since its premiere in 2006, in Austria, Dusseldorf, Munich, Berlin, Ljubjana, and Tianjin (China) among other places.