1. Metamaterials: what is out there and what is about to come F. Dell'isola, D. Steigmann, A. Della Corte, E. Barchiesi and M. Laudato; 2. A review on some selected examples of mechanical metamaterials E. Barchiesi, F. Di Cosmo and M. Laudato; 3. A review on some selected examples of acoustic metamaterials E. Barchiesi, F. Di Cosmo and M. Laudato; 4. The pantographic metamaterial: a (not so) particular case F. Dell'isola, M. Spagnuolo, E. Barchiesi, I. Giorgio and P. Seppecher; 5. Naive model theory: its applications to the theory of metamaterials design F. Dell'isola, E. Barchiesi and A. Misra; 6. Lagrangian discrete models: applications to metamaterials F. Dell'isola, E. Turco, E. Barchiesi, F. Di Cosmo and M. Laudato; 7. Experimental methods in pantographic structures F. Dell'isola, T. Lekszycki, M. Spagnuolo, P. Peyre, C. Dupuy, F. Hild, A. Misra, E. Barchiesi, E. Turco and J. Dirrenberger; 8. Variational methods as versatile tools in multidisciplinary modelling and computation U. Andreaus and I. Giorgio; 9. Least action and virtual work principles for the formulation of generalized continuum models F. Dell'isola, P. Seppecher, L. Placidi, E. Barchiesi and A. Misra; Index.