For five days in late April 2003, a team of engineers and technicians took control of the atrium at UCSF Genentech Hall. Their task: to hang five pendants, each 35 feet long and weighing 1,800 pounds, the first installation of an ambitious public art program at UCSF's new Mission Bay campus. The red-and-orange aluminum structures, designed by California artist Jim Isermann to suggest if not actually resemble molecules, are lit from within by white polycarbon globes arrayed along vertical tubes. The hanging and mounting of the pendants presented a daunting challenge to the display team, some of whom had to hang from the ceiling like trapeze performers to guide the structures into place. The photo essay that follows highlights the quiet drama of the installation and the art behind the art.