The interior of the Norwegian house in the 16th century. Still an open fire pit in the middle of the house.. just like an old Viking longhouse. Tinn Museum Rjukan Norway

By the 18th century they got a fireplace in the corner of the house...Now thats progress! Tinn Museum Rjukan Norway

Norwegian house in the 18th century. The dove tail joint arose after the Vikings returned from Russia...So a thousand years ago and the connection is still used today.