1. Semeion Research Center, Rome, Italy
2. Department of Mathematical and Statistical Sciences, University of Colorado, Denver, CO, USA
3. Department of Humanities, IULM University, Milan, Italy
4. Department of Art History, University of Uppsala, Visby, Sweden
5. metaLAB (at) Harvard, Cambridge, MA, USA
6. FBK-IRVAPP, Trento, Italy