Steve demoed it during one of the Macworld keynotes, so I don't think it's too much of a stretch to think it was put there so he could demo the effect. I recall

Steve demoed it during one of the Macworld keynotes, so I don't think it's too much of a stretch to think it was put there so he could demo the effect. I recall him minimizing a playing Quicktime window to show that the compositing window manager was drawing the video in the 'genied' window.