Boltshauser Architects won the Detail Award 2022 for their kiln tower for a brickworks museum in Switzerland. Roger Boltshauser has also designed larger rammed earth buildings – and observes growing enthusiasm among clients for this natural material. The kiln tower in Cham, which you designed with students from TU Munich, is apparently the world’s first building made of prestressed rammed earth. How did it come about? The museum is on the site of an old brickyard, which included a customary clay pit. The management wanted to show what was possible with this material and asked if we could design a rammed earth building for the museum grounds. At the same time, it had to be a temporary structure because it was not located in a designated building area.