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I don't know about you, but I find this one rather charming! Just demonstrates the Plattenbau were a failure of imagination, not materials

[] https://commons.wikimedia.org/wiki/File:19860910310NR_Rostoc...

It fell out of fashion because the size of rooms in those flats was limited by the size of the biggest panel, which was small indeed. Also, those panels conduct vibrations very effectively.

It's also not as well sealed as insulated concrete forms where you pour concrete between, because the panels have gaps.