Earth as a second skin

It seems natural for a building to be built on top of the earth. But that does not always need to be the case. Why not use the earth as a second skin. In that way, you create a free, high-performance insulation layer while minimising the building's impact on the natural environment. And this does not need to at the expense of daylight. If it is so interesting, why doesn't it happen more? That is one of the questions moderator Rik Neven will put to some architects who are absolute advocates of this way of building and will substantiate this with some interesting cases.

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