The good ol' steel casement window. “It’s a kind of commitment to a classic Modernism which is rooted in traditions of authenticity.”
Source: Vatner, Jonathan. "Casement Windows Are Architects' New Darling." NYTimes. New York Times Company, 24 Nov. 2010. Web. 7 Jul. 2013 <http://nyti.ms/1wqUV15>.