Calling all city mice: Muji has released prototypes for three prefab houses designed with the weekend getaway in mind. Putting the retailer's trademark minimalism to work, signs on the houses invite viewers to “slip away from the hustle and bustle of the city to a place where you can feel instantly at home and at ease.” How do you say "I want to go to there" in Japanese? Each house was the creation of a different designer: Konstantin Grcic, Jasper Morrison, and Naoto Fukasawa. And like the homes of the three little pigs, each one is different. Grcic’s is the sparest, with two levels, an outlet, and a ladder — but no bathroom — for those who prefer to rough it.