In my view of the evolution of solidstate physics, the 1970s were the decade of bulk phenomena. We made enormous strides in understanding crystals—we mapped their energy bands, developed clever computational schemes and became experimentally and theoretically adept at characterizing solid crystals. At the same time, we developed the tools to study surfaces, and we continue to make amazing progress in this area, as Shuk Y. Tong explained in a recent article (PHYSICS TODAY, August 1984, page 50).