Contents Foreword. Harmonic Interference David Leatherbarrow Introduction. Materializing Light and Gaze The Filter as a Limit of Space Approaching the Idea of the Limit Transforming Matter Contour Conditions On the Geometry of Filters From Tradition to Virtuality: Historiographic Categories The Dissipated Space Behind the Filter The Filter as a Transitional Space A Place of Lights and Shadows The Vision of the Horizon Exterior and Interior Landscapes The Transitional Space: Ma and Engawa The Filter as Structure and Construction Natural Structure and Artificial Structure The Structure of the Filter: Operations of Subtraction and Addition The Stereotomic Filter: Predominance of Matter Over Air The Tectonic Filter: Predominance of Air Over Matter From the Perforated Box to the Disaggregated Framework Generative Strategies Strategies of Origin. Earth Filters and Air Filters Earth Filters Royal Bath. Comares Palace. The Alhambra. Granada, Spain. Fourteenth Century Air Filters Recoletos Court. Madrid, Spain. Eduardo Torroja; Secundino Zuazo. 1935 Strategies of Density. Heavy Filters and Light Filters Heavy Filters Melnikov House. Moscow, Russia. Konstantin S. Melnikov. 1927 Light Filters Shuster Hall. Hunter College. Bronx, New York, US. Marcel Breuer; Robert F. Gatje. 1959 Strategies of Thickness. Shallow Filters and Deep Filters Shallow Filters Sarkhej Roza. Ahmedabad, India. Fifteenth Century Deep Filters Tower of Shadows. Chandigarh, India. Le Corbusier. 1956 Strategies of Function. Structural Filters and Enclosing Filters Structural Filters Public Library. Seattle, WA. Rem Koolhaas; Joshua Prince-Ramus. 2004 Enclosing Filters Dominus Winery. Napa Valley, CA. Herzog & De Meuron. 1998 Strategies of Attention. Ground Filters and Figure Filters Ground Filters Heilige Familie Church. Oberhausen, Germany. Rudolf Schwarz. 1956 Figure Filters Notre Dame du Haut. Ronchamp, France. Le Corbusier. 1955 6. Conclusions: Behind Architectural Filters Index Acknowledgements Biography