“(...) At this time I was reaching into music and into flux. I was working with kinetic sculpture, building toys that would flip-flop. I didn't have the expertise for these because they needed to be electrical. So I said to myself, I know photography. Why can't I take these ideas and bring them into photography? Percussion, the playing of one beat against the next, began to translate into photographs.”              RAY K. METZKER    (Lido em: “Brooks Johnson Photography Speaks / 150 Photographers On Their Art, Aperture Foundation, New York, 2004)