Frame being moved

The steel frame of the super-slim Keret House was assembled in steel-skeleton form in a workshop just outside of Warsaw, Poland, and transported to the site by crane. Polish architect Jakub Szczesny says he was drawn to the narrow space between a prewar apartment building and a postwar co-op because of the history it embodied.

"I fell in love with a space between two buildings from different periods," The New York Times quoted Szczesny as saying. "I decided to make a link."