 In addition to making harmonic use of the modes of limited transposition, he cited the harmonic series as a physical phenomenon which provides chords with a context which he felt to be missing in purely serial music. An example of Messiaen's harmonic use of this phenomenon, which he called "resonance", is the last two bars of his first piano Prélude, La colombe ("The dove"): the chord is built from harmonics of the fundamental base note E.
