Piano/Video Phase — kottke.org

In 1967, Steve Reich wrote a piece of music called Piano Phase. The piece is performed by two pianists playing the same piece of music at two slightly different speeds. As the piece progresses, the music moves in and out of phase with itself. Classical percussionist David Cossin performed with a duet of Piano with himself to produce a Piano/Video Phase: Give it 30-90 seconds for the phase shifting to kick in. For those who aren't so musically inclined, this pendulum phasing video provides a more visual representation of what's going on:

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