Sam Willis and Alessio Natalizia crossed paths in 2009, when the former’s remixed a track by the latter’s project. The pair soon began collaborating as Walls, creating a comforting noise inspired by the ambient end of Krautrock and modern IDM — à la and and the output of labels like and . and Natalizia uploaded a track titled “Burnt Sienna” in October 2009 and were soon signed by Cologne, Germany’s label, which issued a self-titled disc in 2010. Although it was only half an hour in length, it was a wholly satisfying debut that incorporated pulsing trance-state IDM, pastoral folktronica, and friction-filled beatless pieces.