Bodily positioned intervention art creates some remarkable challenges for the conception, development and achievement of interactive, electronic sonic works. Analysis of multiple spectators, habitat reactiveness, display modes, socio-political impact and planning strategies are considered through a case study of my own artwork. I trace the challenges in this field using a recently installed interactive piece, Sonic Space #05, which unfolds as a functional interrelated system with undetermined pathways to real-time sound creation. This case study provides an investigation into the demands made by the physical world upon intervention art and the subsequent results.