To celebrate the 35th anniversary of Action Against Hunger, Angström, in collaboration with the agency 84.PARIS, designed an interactive installation for the Fête de la Musique in Paris. In four locations across the capital, we set up four connected pianos that allowed passersby to play freely. As melodies unfolded, the installation projected a dual-sided film illustrating 35 years of the NGO’s work. Each note played on the piano transformed the darker version of the film into a positive one, symbolizing Action Against Hunger’s humanitarian efforts. The event received extensive media coverage and brought together a large online audience on social networks. This visibility was further amplified through the creation of a social wall aggregating all the shared reactions.