When criticized about the lack of architecture in Anna Karenina, connecting the themes of Levin and Anna Karenina, Tolstoj disagreed: "The arches of the vault are brought together in such a way that it is even impossible to notice where the keystone is." This book explores the architecture, attempting to trace the pattern of the invisible pillars that support the `arches' on both side of the `vault', leading to the discovery of the `keystone' which Tolstoj tried so hard to keep invisible.