An imperative to develop the social experience of learning has led to the design of informal learning spaces within libraries. Yet little is known about how these spaces are used by students or how students perceive them. Field work in one such space is reported. The general private study practice of undergraduates was captured through audio diaries, while activity in the learning space was directly observed, and students provided reflective perspectives in focus groups and through spot conversations. Results suggest such spaces are popular and yet stimulate limited group work. Yet other, less intense, forms of productive collaboration did occur and a taxonomy of four such types of encounter is offered. Of particular importance to students was access to a "social ambience" for study. The results encourage institutions to design for a mixed economy of student choice over learning spaces and to consider modes of encouraging diversity in their use. (Contains 3 tables.)