According to Osho, being a 'hollow bamboo' means pure emptiness—no ego, no belief in a God or puppeteer—simply open, content, letting existence’s winds sing through you. Being a puppet, even of God, means being used as a means, a projection of ego and dependency. True freedom is hollowness itself; God-as-player is psychological nonsense he once used pedagogically, now discarded.
Don’t imagine someone controlling you; just be empty and quiet inside so life can move naturally through you, like wind through a flute.