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André De Herde: I am convinced that there is no contradiction. I think Philippe Madec wondered whether the building should be demolished or kept. If he estimated in fine that it was worthwhile to keep it, I think he made the right decision. You do not have to demolish the building every time, but sometimes this makes it possible to create a public space, for example, which can provide a benefit. If Philippe Madec had felt he had to demolish the building to do better, he would have done so.

Robert Célaire: Buildings must not be demolished; they must be deconstructed. We have to revive them and reuse the materials.

De Herde: Yes. MATRIciel is currently working on a building without any new material brought to the site, everything is recovered or recycled.

3) Teacher in Marseille:

When you said that we should invent a material that releases and absorbs heat slowly, this has already existed for a long time: it is raw earth.

André De Herde: In Belgium, if you use raw earth, you will have to heat the building at some point, unfortunately, unless you accept a temperature of 16°C inside. But lime hemp plaster has extraordinary qualities.