Museum displays tend to black-box science, by displaying scientific facts without explanations of how those facts were made. A recent trend in exhibit design upends this omission by putting scientists, technicians, and volunteers to work in glass-walled laboratories, just a window away from visitors. How is science conceived, portrayed, and performed in glass-walled laboratories? Interviews and participant observation in several “fishbowl” paleontology laboratories reveal that glass walls alter lab workers’ typical tasks and behavior. However, despite glass-walled labs’ incomplete and edited (...) enactment of scientific work, displaying an active workplace valuably challenges visitors’ assumptions that science is passive and that museums are home only to facts and dead things. Thus, glass-walled labs do not destroy the black box that obscures scientific practice for nonscientists. Instead, they exemplify a glass box, a kind of black box that contains a performance of scientific work. Glass-boxing describes a common way in which museums present scientific practice—that is, by making it observable but incompletely so—by inviting the public to construct a rich understanding of science as human work. (shrink)