In San Francisco's Tenderloin district, Maya Donelson has filled planter boxes with vegetables on a 900-square-foot patch of roof at the Glide Memorial Church.

It's composed of 1200 PET plastic bottles (walls), 1300 milk and wine Tetra Pack boxes (roof), 140 CD cases (doors and Windows), and an additional 320 PET plastic bottles in the furniture.

Inside, two black boxes form the information desk counter and utilities, while a tree in the middle of the walkway grows up through a gap in the roof.