When Anders Stokholm asked his old friend Felix Jerusalem to design his family’s new home in Eschenz, a northern Swiss village on the Rhine River and Untersee Lake, the client and architect agreed that they didn’t want to disturb the ancient Roman artifacts buried in the property’s wet soil. But they did want something both modern and green. Jerusalem’s solution, the Strohhaus, beautifully merges the old with the new: The structure floats above the saturated ground on pilings—–referencing building methods used in the area thousands of years ago, according to Zurich-based Jerusalem. And except for its concrete core, the entire house is made from slabs of prefabricated, formaldehyde-free compressed straw.