A building includes a tile roof including a plurality of courses of tiles and a roof-cover above which the tiles are positioned, a ceiling below the roof, and a skylight apparatus. For this purpose, the DC power supply has a transformer having at least two auxiliary windings having different numbers of windings that can each be connected via a switching device to the series regulator. A weighted voltage is applied in accordance with desired display data in each of the plurality of intervals to achieve a gray scale display. A first middle plate, a second middle plate and a third middle plate are formed in the waist of the outsole and widthwise partition the inside of the rim.