When disaster strikes, the need for short-term housing is immediate and urgent. The Department of Homeland Security estimates that more than 800,000 people were displaced after Hurricane Katrina in 2005, and UNICEF reported 130,000 residents were made homeless by the 2006 earthquake in central Java, Indonesia.State-provided housing is expensive, too temporary and can be potentially harmful to residents. A growing number of architects and designers is exploring humanitarian design for people displaced by a natural disaster or other emergency. This gallery shows some of the most promising quick-fix shelters, from inflatable concrete tents to houses made from recycled wood pallets.