Things whirr, click, glow, and tremble in this sprawling, multiple-site exhibition. “PULSE 2”(the name is an acronym for people using light, sound, and energy) features more than 80 works by 60 artists concerned with the interrelatedness of art and physical phenomena. The more mechanical aspects of this practice were once called “kinetic art,” and a number of important figures in the history of kineticism are represented here, along with contemporary artists working with a variety of new technologies, including computers, fiber optics, and audio and video electronics. There are even a few works