As an homage (and a tribute) to film director Michael Haneke who directed a film of the same title, Code Unknown, Satoshi boarded a train in Berlin with his camera and photographed strangers from 6am to 8pm for several months, just like the photographer character in Haneke's film, who takes candid photographs of passengers sitting in front of him on a train. Each photo is then edited to the point where the identity of his subjects cannot be known.