It is a big word, maybe too big a word for a project initiated by students. Then again, that is what studying is all about. Taking responsibility for oneself, for one’s surroundings, for the society we live in and for the earth we live on. There are countless opportunities to be responsible every day: for example by switching off the light when leaving the room at 5 A.M. Responsibility starts with what is already there: green areas, Altbauten, Berlin’s war gaps — instead of tearing down and irresponsibly building out of context, the Rooftop House uses existing architectural and social structures. We feel responsible for the city we love, and aim to transport this feeling throughout our house: building with local materials, using renewable energy, integrating into society, drafting a long-lasting solution.