Synchromy (French: Synchromie) is a 1971 National Film Board of Canada visual music film by Norman McLaren utilizing graphical sound. To produce the film's musical soundtrack, McLaren photographed rectangular cards with lines on them. He arranged these shapes in sequences on the analog optical sound track to produce notes and chords. He then reproduced the sequence of shapes, colorized, in the image portion of the film, so that audiences see the shapes that they are also hearing, as sound.
