We visit the Bouroullec brothers' studio in Belleville, France, and discuss the process behind their designs. "All our projects are site-specific, created for a particular company," Erwan Bouroullec said. "All have their own logic and character—none are a copy-and-paste of something else. They generate from a simple question: how do you build this, how do you use this?" Shown, the Osso chair’s different parts. Image courtesy of Studio Bouroullec.