A cold-water flat is a type of housing that was popular in the late 19th and early 20th centuries. It is a term used to describe a small, inexpensive apartment with no modern amenities such as running water or central heating. The term 'cold-water flat' comes from the fact that these apartments had no hot water, and tenants had to rely on cold water for bathing and other needs. An Igloo is a type of shelter made from blocks of snow, traditionally used by the Inuit people of the Arctic region. It is constructed using a dome-shaped frame of blocks of snow, and is insulated with fur or other materials to keep out the cold.