Each concrete block measures 16 inches square with a 3.5-inch thickness. They were made by hand using aluminum molds.

  Photo 10 of 23 in Frank Lloyd Wright’s Iconic Ennis House Is Listed For $23M

Frank Lloyd Wright’s Iconic Ennis House Is Listed For $23M

10 of 23

Each concrete block measures 16 inches square with a 3.5-inch thickness. They were made by hand using aluminum molds.