Two components of the boundary of \(\text \textbf{I}_3\). (Deux composantes du bord de \(\text \textbf{I}_3\)) Selected works of Phillip A. Griffiths with commentary. Part 1: Analytic geometry. Part 2: Algebraic geometry. Part 3: Variations of Hodge structures. Part 4: Differential systems. Edited by Maurizio Cornalba, Mark L. Green, Wilfried Schmid, Enrico Arbarello, Joe Harris, C. Herbert Clemens, David R. Morrison and Robert L. Bryant 