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 5 of 15 in Cubic House in Heidelberg by Hermann Althoff

Cubic House in Heidelberg

5 of 15

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.