Behind every digital action there is a body and a skin that executes the actions and makes them visible. But we also find bots and content self-generated by artificial intelligences or algorithms. In Subsurface a new skin is generated for the EP7 building in Paris, France in which the skins / textures of real humans are shown to give that new layer to the architecture, but also details of their DNA sequences are shown that, in some way, tell us about the interior of those users and validate them as real.