What he is looking for at first and foremost, are unusual and transitory scenes that nobody notices despite their interest, incredible colour schemes or emotional evocation. Observation seems to be the key to his approach. Guillaume believes his work is more related to a form of expressionism than to a conceptual approach since it captures time, change and the state of things. It is when he manages to capture the illusion of reality that he considers he has managed to achieve a photograph that is unique, one that can not happen once again. Guillaume calls this… The Concordance of time.