Man trapped in the clock

This clock is one of the best in the world. It's one of the most original clock related ideas I've seen so far. The clock is made of a big wooden box, the size of a human and it has a translucent window where you can read the time. The very weird part is that you can see a blurry man that seems to be hiding inside the clock, drawing lines and erasing them every minute. There is really no one in the clock, the window is just a screen showing a recording of the clock's creator. I can't imagine how he could have the patience to record himself for 24 entire hours...