The task to clad a structure with an elevation of 180 M in a completely transparent way gave us the challenge to find a scale related to the people as well to the highway along it. The idea is to work with a transparent material but in a sculptural way, emphasising the effect of transparencies and translucencies of this material. In fact glass is wrongly considered a transparent material. Through the different reflections it becomes through infinite nuances, opaque. The geometry of prismatic shapes based on triangles offers surfaces that catch the natural light in different angles throughout the day living the impression of a material surface that suddently becomes transparent depending on the position of the viewer.