At Heilige Boontjes, former prisoners return to society by roasting and selling coffee. Their motto: ‘we don't hire people to sell coffee, we use coffee to hire people.’ And at i-Kapitein, you can combine pedal boats with plastic fish. Twice the fun. Many sustainable projects, however, take place behind closed doors. Such as at BlueCity, Keilewerf and De Kroon. That makes sense because hard work is also necessary. But you can keep an eye out for events and get to see them that way.