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This is a link post One of the most interesting optical illusions you will ever see - the spinning ballerina
Try just looking at the image and attempting to control your perception of the way the ballerina is spinning. It's quite the mind bender.
 (I helped save b3ta! Grundlebiscuit, Tue 3 May 2011, 11:13, , Reply)
This is a normal post ? either I'm a freak of nature
or that's not hard to follow at all
She's rotating counter clockwise (her left leading) and going up and down at the same time with a slight angle tilt on the 3d model.
Reading the bit at the bottom I don't see how it could be going clockwise.
 (I helped save b3ta! HappyToast Groat froth, Tue 3 May 2011, 11:25, , Reply)
This is a normal post
sorry, how do I get back to the 21st century?
 (poocheim No al calcio moderno, Tue 3 May 2011, 11:30, , Reply)
This is a normal post I concur
There is no illusion there.
 (bogus official shove it up your cunt, Tue 3 May 2011, 11:33, , Reply)
This is a normal post If you look at the shadow at the bottom it sometimes helps to flip this 8 year old image around.

(I helped save b3ta! mike woz ere 7442200 & 7696970 getter, Tue 3 May 2011, 11:36, , Reply)
This is a normal post 8 years old?
She looks at least 16 with those nawks.

I'll get my coat...
 (I helped save b3ta! Cerebus Sticky! Sticky! Stick! Stick!, Tue 3 May 2011, 11:43, , Reply)
This is a normal post You can percieve it both ways.
That's the illusion.
 (I helped save b3ta! mike woz ere 7442200 & 7696970 getter, Tue 3 May 2011, 11:35, , Reply)
This is a normal post like sex

(tichy, Tue 3 May 2011, 11:39, , Reply)
This is a normal post ahhhhhhhhh, I think I see what people are talking about but it's not exactly an optical illusion
it's just about perspective/camera positioning.
The bad angling of the 3d model causes her foot to lift off the ground giving you a minor forced lower angle of the animation. So what you can see if you stare at the feet is like looking at her from under a glass surface (you pervert) and therefore a reverse motion of what she is doing.
Looking at her upper body clearly (in my mind) shows the direction.
if it wasn't a silhouette it would fall apart horribly.
 (I helped save b3ta! HappyToast Groat froth, Tue 3 May 2011, 11:44, , Reply)
This is a normal post It is an optical illusion because it forces the brain to make an assumption about the direction of rotation.
Either assumption breaks down when you see the images rotation switch. Not everyone sees it rotate the same way initially.
 (I helped save b3ta! mike woz ere 7442200 & 7696970 getter, Tue 3 May 2011, 11:47, , Reply)
This is a normal post Look at it out of the corner of your eye and it might switch directions.
worked for me
 (I helped save b3ta! Cerebus Sticky! Sticky! Stick! Stick!, Tue 3 May 2011, 11:37, , Reply)
This is a normal post I can make it change.
Look at the shadow, and picture it spinning anti- clockwise, and she flips. Then look at her tits, and she flips back to clockwise.
 (I helped save b3ta! The Awful Puppy Bakery is still bored, Tue 3 May 2011, 11:44, , Reply)
This is a normal post In my experience, all women flip when I look at their tits.

(Pie of Meat ___°¬¯O¯____\o/_____/\_,____Y¯¯Y, Tue 3 May 2011, 12:11, , Reply)
This is a normal post Arf!

(I helped save b3ta! H.B.Mupps, Tue 3 May 2011, 17:12, , Reply)
This is a normal post Arghh smashes monitor!!!
Arghhh it only goes one way!!!

It's a bloody conspiracy to drive me mental!!!

It does not go both ways EVER!!!!!
 (Captain_lambkin adifferent.me, Tue 3 May 2011, 14:41, , Reply)
This is a normal post That's what I thought to begin with
Try covering up the ballerina and only looking at the reflection, that bit is much easier to 'switch' in your mind. Then slowly reveal the ballerina from the feet up.
 (Zachariah Pardon, pardon. J'AI UNE POUSSETTE, Tue 3 May 2011, 18:10, , Reply)