Interestingly, while the file that encodes the graph does not contain any information about clusters (except for isolated clusters, as explained in the second article, and for the colors of the nodes, for rendering purposes), the rendering engine that transforms it into a PDF, creates an organic (albeit imperfect) formation of clusters: the Myst Island in the middle, and the Ages at the periphery. This isolated cluster comprises 3 nodes, including 2 virtual ones, from the Mechanical Age: originally, 17552 had directed edges with 20348 and 17673, both absent from the Mechanical Age stack. The quasi-totality of the edges is either directed (they connect two nodes in one direction) or bidirectional (they connect two nodes in both directions).