Featureless boxes of glass, with every floor of the box a set of rigid white corridors, each indistinguishable from the next. It's not a terribly livable design for humans, even if it does appeal to a small segment of the population. Human memory is associative, meaning that you need a context in which to know things. Variations in form and style between the floors of a build and between buildings themselves helps members of the community to navigate efficiently. If everything looks the same, most of the population will get lost fairly quickly.