The church on the grounds of the former concentration camp is half underground. A gesture of humility, the result of discussions on the role of the Protestant Church during the Third Reich. An example of concrete as a metaphor for nature: building and surroundings unify to create a landscaped section with the edifice resembling a rock.
About the source: SOSBrutalism
SOSBrutalism is a platform for a campaign to 'save our beloved concrete monsters'. You can contribute to the content SOSBrutalism provides, on their website.