Heavyweight construction is not the only method employed here: this home is a hybrid. Although the stucco-covered structure brings to mind a pebble set in the landscape, only its core is of concrete. Its outer shell consists of a layer of cellulose (depth: 32 cm) and a wood loadbearing structure.

The design with a 10 x 10 m footprint makes use of passive climate control, has no basement, and is equipped with a heat pump, mechanical ventilation and panel heating. The large windows and facets are visible from afar. The idea behind the form: in order to attain the best possible ratio of area to volume, the architects sought to approximate a sphere.

The placement of the windows takes into account the position of the sun. The panes – at nearly 10 m2 each – supply significant solar gains, while the core acts as thermal storage. For natural ventilation there are small opaque apertures and the large sliding doors on the ground floor. The approach to the design could almost be considered pragmatic, yet creates astonishing results inside.

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