There's a lot of mathematics going on in this house. The roof is a viviani curve, the intersection of a sphere with a cylinder. The second floor is the shape of a lotus leaf and the body of the home is a lemniscate, the symbol of infinity.
Cob homes! And the website has more construction types for sustainable housing I'm loving these example of larger family sized cob homes that don't all look like hobbit holes.) I like that cob can be freeformed
Cob Building Basics: DIY House of Earth and Straw - Green Homes
Lotus Cottage in West Virginia, USA has a rubble trench foundation with exterior straw bale walls plastered with lime outside and clay inside. All the timber was locally grown and lots of salvaged parts like windows were used in the building.