Martin Wolf and three co-workers from architectural firm Solomon Cordwell Buenz & Associates designed the world's largest sun wall to cover the barren south wall of Department of Energy headquarters in these undate photos in Washington. The winning artist rendering design (R), spanning two-thirds of an acre was awarded a $20,000 prize by the Department of Energy. The wall supported by cables underneath, will extend from the top of the south wall of the Department of Energy building to the ground, forming a huge isosceles triangle. The space beneath the solar drape, which is now the parting lot, will be equipped with a walkway and pools of water. On the right is the current department of energy.