Bjørn N. Sandaker is a structural engineer and Professor of Architectural Technology at The Oslo School of Architecture and Design (AHO), Norway, as well as Adjunct Professor at the Norwegian University of Science and Technology (NTNU) in Trondheim, Norway. His particular academic interest focuses on the borderline between architecture and structural engineering. He is author of On Span and Space: Exploring Structures in Architecture (Routledge 2008) and co-author of Model Perspectives: Structure, Architecture and Culture (Routledge 2017). Arne P. Eggen is an architect and Emeritus Professor at The Oslo School of Architecture and Design (AHO), Norway. For over three decades he taught and conducted research on the architectural basis of structure and bridge design. Eggen has been awarded several international prizes for his bridge design work. Mark R. Cruvellier is a structural engineer and the Nathaniel and Margaret Owings Distinguished Alumni Memorial Professor in Architecture as well as former Chair of the Department of Architecture at Cornell University, USA. He teaches and conducts research in the area of structural form and behavior considered within the context of architecture and is co-author of Model Perspectives: Structure, Architecture and Culture (Routledge 2017). Cruvellier has worked on numerous built projects ranging from sliver skyscrapers in New York City to wilderness footbridges in British Columbia, Canada.