Well, Ratter15, as they say initially (on the page that the above link leads to), it is confusing. Personally I perceive the small, drawn spiral top right as a clockwise pattern, whereas they use it as an example of counterclockwise. The mere fact that they have to start out by defining what's what does sort of decide this matter in your favour...!
I think the thing with me is that when I see a drawn spiral I don't think of how it was drawn, I just (automatically) think of it as water slurping down the drain. If you do that, then there's no question of what's what, you just 'follow' the movement. But if you do not think of it as movement, then the nomenclature does seem rather arbitrary, I agree.