The house appears obvious, but all do not live in houses. Around the world, people live in a variety of ways. Recently, the paper told of a girl who lives in a train and a woman who has been living in the airport. In Thailand there are families who live in abandoned airplanes. In Mongolia it is usual to live on a thick felt-made tent, jurt. Certain tribes live in mud huts and some live permanently in a tent or caravan.

However houses have their pros and cons. Houses are easy to heat, and they provide good protection from wind, rain, wild animals and uninvited guests. On the other hand the houses are expensive and require a lot of care. Houses can not be moved. That is one reason why, for example, the circus people living in caravans.