The concrete volumes of the upper and lower floors are independent to allow expansion and compression.  Photo 2 of 6 in Amazing Futuristic Homes from Austria to Spain by Eujin Rhee from A Bunker-Like Home With a Green Roof Brings the Best of Avant-Garde Architecture to Catalonia

Amazing Futuristic Homes from Austria to Spain

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The concrete volumes of the upper and lower floors are independent to allow expansion and compression.