"Version: 20200901"--Title page verso.Includes bibliographical references.1. Introduction -- 1.1. How does light meet with matter? -- 1.2. Collectivity that matters -- 1.3. At the boundary from quantum to classical worlds2. Light-induced dipole-dipole interactions -- 2.1. Reservoir interaction volume -- 2.2. Resonant dipole-dipole interactions in free space -- 2.3. Two-dimensional dipole-dipoleā¦