What doesn't work is that the color values are the same. As you look at the blocks, the fans all have the same value (dark). They run together along with the center "circle".
I would do as the others suggest and try some different layouts and see if that helps.
This is not a fan, but is a similar block. I didn't make this, but bought it in an estate sale. It might give you some idea of what I am talking about.
bkay