And outside the walls, bum bum bum bum, that's where the peasants and the artisans lived. They lived in these little hovels and they scattered around for food. So a very strict social class system is evident from the Shang Dynasty. We also know that military and defense was very important to the Shang Dynasty. Now I talked about all those awesome geographical features that protected them forever. Well, not forever. That means that a lot of their technology is going to be focused on military.