Aurora: Making the invisible visible. 500 independent ambient electromagnetic field analyzers were spread over the Parc de Bassens (France), for the PanOramas Biennale 2016. If there was a slight change which created an electric disturbance, it brought about a small light and sound signal. Like a Geiger counter, the permeability of sound and visual transcription can be shown on a very large scale, showing up fields or flux. We drew up an invisible landscape for the installation; random, geographically varied, and urbanized; this cartographic experiment explored the area and its electromagnetic pictorial aspect. Textured by micro-sounds, these waves draw up a "digitalization" of the park, showing both the world we see, and our influence within it.