Welcome to the 21st century. 1st Dibs, the online destination for antique and vintage furnishings, will launch a new category of furniture on Oct. 21, called 21st Century Design. The department will sell one-of-a-kind and limited-edition pieces between $5,000-20,000. One of the initial offerings will be a limited edition of Poul Kjaerholm's 1953 Molded Aluminum Tripod Chair ($15,000) in blue, gray, yellow, and black from R 20th Century — who had a booth at the 20th Century Modernism Show in San Francisco last month. It's no surprise really that 1st Dibs is going this route, seeing how well modern designs are selling these days. But the truth is, the website already sold these items; they just didn't have their own category. Are you a fan of 21st century design?