Louis Kahn's rethinking of modern architecture's paradigm of space is one of his lasting contributions to the métier. The drawings for the iconic unbuilt project for the Dominican Motherhouse (1965-69) provide an intimate view of the architect at work on a few fundamental questions of architectural space: seeking the sources of its meaning in its social, morphological, and landscape dimensions. This compelling case study opens the way to explorations of Khan's deepening understanding of space through several of his major works, providing new inroads to this architecture's rich spatial poetry. The result of extensive research, and generously illustrated with unpublished archival material and new diagrams, this book is both an ideal introduction to Khan's thought and a timely re-evaluation of a work of enduring relevance.