A house that has only one room (like a box), but all the functions of the house are achieved with components inside the house. For example, there could be movable interior walls instead of permanent interior walls.
I vaguely remember reading about something like this 10 or 15 years ago. I think it was in a book about Cliff May, the California architect, but I could be wrong. Anyway, the architect moved his family into a large rectangular box with only the bathroom having walls. The kitchen sink was fixed in place, of course, but nothing else. They had a whole bunch of closet/shelf units on wheels to move around as they wished. The kids no longer argued about whose room was bigger. The architect found it a valuable experiment in what spaces were used and necessary, but after a few years, the family moved into a conventionally (for California in the 50s) partitioned space.
I think it would be good for rental units. I suspect most people with this option would move in, rearrange a couple of times at the beginning, then leave it the way they like it. When new tenants come in, they can do it all over. But when thinking about the home you want to live in for a long time, it feels like wasting opportunity. Maybe I’m wrong. Maybe a growing family could make use of this flexibility.