In collaboration with the Luxembourg prison, a solution was developed that would address requirements imposed by the function of the system, the geometry and architecture, and constraints from the existing building. The result was a steel rope/beam grid consisting of equilateral triangles suspended by steel ropes from centrally located pylons. Posts support the edge beams and provide reinforcement. Covering the grid is a mesh made of high-strength, twisted steel wire strands. Additional support for the mesh cover is provided by steel ropes that lead from the pylons and are connected to central locations in the mesh spans. Guy ropes impede access from the air, and the mesh covering protects against physical intrusion. The wire mesh panels are secured by specially-developed bonding elements. The entire construction is not connected to the existing buildings.