Muller Van Severen has mushroomed from a make-do moment at home into a commercially successful design studio. Benjamin Dane meets the founders where it all began—at the bottom of their garden. There are only a few dozen steps between the blue front door of Fien Muller and Hannes Van Severen’s home and the entrance of their acclaimed studio, Muller Van Severen. Across a courtyard, overlooking the garden, an old orangery has been transformed into a two-story office and atelier for