Alexia Kraft de la Saulx moved to Spain from Belgium with her family when she was three. Here she found her vocation in social documentaries. She won the London Eco Film Festival with her short film Robert’s Rooftop Farm. This short teaches us that we can use sustainability to improve the world. Robert has his own garden on the roof of his house in Barcelona and shares the vegetables he grows with his neighbours. We talk with her about this project.