As more and more people get concerned about the cost of housing, or the cost to the environment of making/maintaining housing, some people have honestly started to think smaller is better.
Here is an example of how you can pack a lot of luxury into a small space –
Personally, though, I’d rather go underground. If your home has at least 10 feet of earth on all sides, you’re going to have the lowest carbon footprint measurable, and if it is all electric and powered with solar/wind, you’ll generate more electricity than you need. Seriously. Pour it back into the grid, and you’ll make money off of living that way.