My favorite kind of art is the kind that involves participation from the audience, making each viewer both the artist and a part of the art piece itself. Cata Sopros is an interactive sound installation that harnesses the power of the human breath. This collective musical instrument is made from paper windmills that transform the users’ breath into sounds. The windmills were built with electret microphones at the front to sense any wind blown intentionally on the paper. The video was shot at the cloister of the beautiful Alberto Sampaio museum in Guimarães.