Which direction is the girl spinning in the animated image below?

At your first glance, the girl should be spinning clockwise. That is what I see too at my first glance. Now, look and focus at the shadow below her feet. Look up again to the girl, she should be now spinning anti-clockwise.
This is how I make it spins clockwise again. Cover the top part of the image with my hand and focus on her legs. This isn’t accurate, but it works for me. You might want to experiment how it works to you. Stare at the image long enough and it might again change direction. Weird huh?
Is it true that it won’t change direction because it’s a video pragramme it to do so?
Wow! Freaky!
I think it’s just the slight tilt in the motion playing a mind trick on you so your mind thinks it is going in the opposite direction.
I rather like optical illusions, usually they’re just static images, but this one is pretty cool given it’s a moving one.
Something wrong with my eyes (or brain)… it’s clockwise all the way. >.>
Very interesting. It’s a great feeling when you finally get it working in either direction.
Fucking hell…..it’s alwaz clockwise.
Hw can u see anti-clock?
Goto Doc!
This is MY theory:
It’s just a shadow. You can’t really tell if the image is facing forward or backward, but since we are used to people looking at us, our first impression is that the dancer is looking at us. The dancer’s leg is moving left, stops, right, stops etc. If on the split-second your eyes saw the image, the dancer’s leg was moving left – you would think that she was spinning clockwise. If it was moving right – you would think that she was spinning counter-clockwise. From that point, your brain had already decided which direction the dancer was spinning and it would be very difficult to change your mind without looking away. It is about the exact split-second your eyes first saw the image.
How’s my theory?
Its no optical illusion. It actually changes direction.. its as simple as that. Sometimes it will spin clockwise.. sometimes counter clockwise.
x.x What if her legs are spinning clockwise and her torso is spinning counter-clockwise!? AHHHH the quest for where my brain is centered…ceases to end…
Check this link, http://games.yahoo.com/braingames/brain-teasers-g…
It's another version of this using a cat, and it's a bit easier to manage…
Simply focus on the cats front (or top) legs, then at the moment they overlap into the cats body trick your mind to switch the direction……picturing the legs as moving front to back instead of side to side helps me.
I have even been able to make the cat dance from side to side without ever turning all the way around.
I just did a bit of research on this and it appears to be that the original intention was a counter clockwise spin, the part of the image where her legs meet (around frame 13) has an overlapping shadow effect that implies the left leg was intended to be the outstretched one.
Here's a link to explain it further http://ofb.net/~whuang/imgs/spin/
(This may also explain why it is so hard to make it switch direction on will without covering parts of the image, since your brain picks up on these tiny details and uses them to process the image.)
I just did a bit of research on this and it appears to be that the original intention was a counter clockwise spin, the part of the image where her legs meet (around frame 13) has an overlapping shadow effect that implies the left leg was intended to be the outstretched one.