We participated to the PHD-SDC event, an opportunity created by the IUSS of Pavia to allow students of the various PhD classes to interact, get to know each other and discuss their research projects; three days full of conferences and group work on the issues promoted by the SDGs. We helped students digitally visualize their theories as they worked in parallel, and collected the key themes of the days in a large Knowledge Wall set up in the plenary hall. It was nice to understand together how important it is to have a visual representation of scientific theories that usually are almost inaccessible for non-experts.