Claimed as coolest house ever, the Stairs House or Kaidannoie is a residential home designed by y+m design office located in Shimane Prefecture, Japan. The clients are two teaching parents and their kids. They want a warm, bright and private space where they could invite their students over. As the result, it has stairs for the house’s roof. The owner can climb and get some view from the stairs roof. The space between each stairs filled by Glass slits, allowing light to shine in while creating a natural shade for privacy. On summer it will cool because the maximizing ventilation, but on winter it will warmth.