Quote:
Originally Posted by TGS
It's an illusion - it's not rotating at all, being a two dimensional image. The point is that we can perceive it to be rotating clockwise or anti-clockwise and this appears to be bi-stable - it seems to just flip between the two possibilities, though having disambiguated to the image to be moving in one direction it is sometimes quite difficult to "get it" to go in the opposite direction.
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Well, not for my mind. To me, it's always spinning clockwise, and though I can understand how it should look if it was spinning anti-clockwise, I can't make my mind see it as such. Only clockwise.