Dutch architect Frits van Dongen discusses his building, The Whale. The Whale is the centerpiece of Borneo Sporenburg, a high-density urban housing development situated on Amsterdam's eastern docklands. Van Dongen describes how many units in the building do not share the same floor plan.

"e²: the economies of being environmentally conscious" is an ongoing PBS documentary series about solutions to the world's most pervasive environmental challenges. The 2007 season continues with "e² design season two", the flagship sustainable architecture series examining innovations in green building and planning from around the globe. Check your local PBS listings for television broadcast dates in your area.

The "e²" series and its video podcasts are produced by kontentreal, and distributed within the United States by PBS. More information is available at pbs.org/e2/ and e2-series.com/