Glorious Mud
In the course of what passes for an education in your country you may have been told that poor people in the Olden Days often lived in homes made of wattle and daub, that is, a framework of sticks with mud slapped on. You may also have heard tell of people in a place called Africa who live in mud huts. If so, it is almost certain that you were given the impression that these are inferior dwellings: after all, mud is dirt, and dirt is dirty, and certainly not as sturdy as proper construction. Depending where you live, ideas of what proper construction is may diverge: in Germany, rendered walls made of concrete blocks are the way to go, in England it has to be brick, while in Scandinavia and North America they prefer wooden frame construction, presumably because it helps get rid of the excess trees.