But actually the house is located on a steep hillside. This patio is grassed in to seem like ground level. Terraces make it seem as if it is on flat ground.
The structural Engineers, David H. Lau and David Maynard make the
pool do double duty as a bulwark against the steep site so that a flat
lawn can be made behind it.
And, in fact, this swimming pool is actually forming a retaining wall at the bottom of the steeply sloping original lot.