Well, I can imagine it in both directions, with some concentration, I can make it switch direction...
And no, it's not some blue dots moving along a circle, it's some blue dots moving from the left to the right while becoming slower toward the ends of their specific route, the problem lies in the fact that they do not scale, with a real orb, the dots in the background would be smaller than those close to the viewer which our brain would then be able to interprete as left or right turning. I would call this some kind of optically disturbing moving pixel thing, the "sphere" exists only in out imagination because our brain gets fooled by the different speeds of the pixels....or...that's what I thought before I had a closer look, now I am certain that it is moving counterclockwise because the pixels moving from the left to the right spead out to the top and bottom, when moving from the right to the left, they get closer together because they are further away.

So in fact it's counterclockwise(looking from the top).