The house façade is wrapped around with black slate from the German Mosel valley, a material used for centuries in German castles and churches. Window banks are made of matt finish black granite.   Photo 4 of 4 in Favorites by Hermann Althoff from Cubic House in Heidelberg

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The house façade is wrapped around with black slate from the German Mosel valley, a material used for centuries in German castles and churches. Window banks are made of matt finish black granite.