The Week in Pictures: A House without Walls, Gorgeous Rail Car Garden, and More (Slideshow)

On the Caribbean Sea, Colombian firm Plan B Architects has produced a new kind of Passivhaus -- a bioclimatic building with a roof, but no walls.

We also have an old railway car transformed into a beautiful garden, artists' responses to global warming, an ode to cheese, a fancy new electric bike, and more in our roundup of the best images on TreeHugger this week.

Past Weeks in Pictures:
The Week in Pictures: Camping Trailer is also a Boat, Cats Nap in TVs, and More
The Week in Pictures: Greenland Disappearing, Floating Pod Hotels, and More
The Week in Pictures: Hurricane Irene, Vacation at "Farmland World," and More

Tags: Architects | Architecture | Artists | Arts | Bikes | Buildings | California | Electric Bikes | Gardening | Global Climate Change | Green Building | Nasa | Shoes | Trains | Wine

Best of TreeHugger