These days, public libraries are as likely to have video production studios and 3-D printers as they are shelves of books. One library in San Diego is pushing things even further, with a new biotech lab, where patrons can examine cells under microscopes and even extract and copy DNA.

But in Seattle, a new private library is offering a surprising old-fashioned amenity: a quiet place to sit and read a book.

Called Folio, the nonprofit membership library opened last month, just a block from the city’s Rem Koolhaas-designed public library, with about 300 members. Well-established “athenaeum” libraries -- institutions devoted to literary or scientific study, like the libraries in Boston; Providence, R.I.; and elsewhere -- can boast 200-year-old collections and cultivate somewhat of an elite status.

But Folio, which bills itself as the first new athenaeum library in more than a century, has memberships as low as $10 a month, and its chief aim is to be a place where book lovers and writers can congregate -- albeit quietly.