the bio towers in lauchhammer, germany were built around a central staircase in sets
of four. originally the towers were used to purify wastewater from the town’s coking plant
by way of internal trickling filters. the IBA and the country’s monument preservation
authorities believed that demolishing the bio-towers would represent a huge and irreplaceable
loss to lauchhammer’s identity and to the memory of the first lignite coking plant in germany.