It's not just a clock, but an ever changing installation that will always need the labor of those men constantly rebuilding it, to keep "running". I find it quite interesting, as an idea. Implementation could be better, I guess, but it provokes some interesting associations and thoughts. Which is, I think, one of the definition of art. To capture an idea or emotion, to reproduce and communicate an experience. Not just a picture.

Of course, it's valid to say that it doesn't work for you, or even that it can't work for anyone, because it's plain stupid. Like so many garbage art out there.