Because
this kind of knife doesn’t stick to the snow
The blocks are cut out with a knife made from walrus ivory as snow does not stick to this kind of knife. Using this method, an Eskimo takes only a few hours to build some.
Inside the igloo, it is warm enough for the family to take off their outer for clothing. A platform of snow, covered with fur and skins, serves as the family bed. During the cold, arctic nights, the entire family sleeps together for warmth. Cooking is done on a stone stove or lamp that burns seal fat or blubber. A small opening at the top of the igloo lets the smoke out and the fresh air in. Even though the air in the igloo my not clear or pleasant smelling. It serves its purpose as a warm, comfortable shelter for the Eskimo family.