The Pop-up Passive House is essentially all insulation

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insulation blocks

credit: Multipod Studio

Multipod Studio has taken that definition to the extreme; the house is insulation, built almost entirely of giant foot thick blocks of high density expanded polystyrene foam (EPS) foam. It's grey because it contains graphite:

The graphite absorbs and reflects part of the thermal radiation and offers up to 20% improvement of the insulation capacity compared to the conventional white EPS, at equal density.