A-frame style houses have a distinctive roof shape with steeply-angled sides (roofline) that meet at the top in the shape of the letter A and a ceiling that is open to the top rafters. It is common in areas with high level of snow fall because it allows the snow to slide to the ground and not weigh down the house. Although the triangle shape of the A-frame has been present throughout history, architect Andrew Geller turned an old idea into a revolutionary concept in 1957 when he built an "A-frame" house in Long Island, New York. This surge in popularity lasted until roughly the 1970’s.