Featuring a delicate filigreed appearance that’s supremely strong, these airy barstools are sculpted out of steel rods. In his art, Bertoia experimented with open forms and metal work, and these chairs were an extension of that work. “If you look at the chairs, they are mainly made of air, like sculpture,” said Bertoia. ”Space passes through them.” After designing his seating collection, Bertoia returned to focusing mostly on sculpture. His work was often used in projects by Eero Saarinen (another Cranbrook friend), notably at MIT and the Dulles International Airport.