Sergio participated in ELIA Conference 2013 at Museumquartier Vienna. His lecture named 'Invisible thing' showed how his theoretical model analyses one's Action Art works. This critical model was part of his Art and Science research project. Through ‘Nippel’ (Nipple) performances Sergio explained how to apply the analysis model about context, efficiency, effect affect, sense making topics and the strange attractor factor within the real experience shared with the audience. The presentation reflected about how the naked body disturbs the audience’s concentration and thus people might miss the small and almost invisible collection shown over his body during the catwalk.