Eero Saarinen, Zaha Hadid, Norman Foster, Thomas Heatherwick, Walter Gropius, Shigeru Ban, Rem Koolhaas, Frank Gehry: If it seems like every architect of note has also designed a chair, it's because that's pretty much true. Why? In her new book Chairs by Architects (Thames & Hudson), art historian Agata Toromanoff says that chairs afford architects an opportunity to distill their techniques, innovations, and style into a new medium. Importantly, they also serve as a rite of passage.