Messiaen experienced a mild form of synaesthesia manifested as a perception of colours when he heard certain harmonies, particularly harmonies built from his modes, and he used combinations of these colours in his compositions. For a short period Messiaen experimented with the parametrization associated with “total serialism”, in which field he is often cited as an innovator. His style absorbed many exotic musical influences such as Indonesian gamelan (tuned percussion often features prominently in his orchestral works), and he also championed the ondes Martenot.