I agree about floaters Dave. Though not everybody is going to try and use them, or even to have thought about using them. To be honest it is moderately easy to create the effect at 200 points with 3 c ...
It is not limited to centre, right and left. it is given as an example.
I have read the author's intent else where on the forum (left/centre/right). But that is not what the rules say. Neither is it ...