How Is This Possible? Optical Illusion

[4FunPlayin]

Got this from smosh


If I look at it normally she is spinning to the left, but if I really concentrate she is spinning to the right? wuuut

[Arteq]

any time i watch its always spinning to right >_>
illusion doest work on me, mommy! ='-(

[surtek]

Yea lol, for me it's also spinning to the right all time. Maybe because our concentration level is 10 times higher.

[No One]

any time i watch its always spinning to right >_>
illusion doest work on me, mommy! ='-(

maybe 4fun's eyes are just f'ed up

[d0h!]

for me its spinning to the right too

[SuperNovaAO]

Was s;inning to the left, switched tab, came back 15 minutes later, was spinning to the right, some tab switches later to the left again

Seen this some time ago and the probable reason why this works is because there is no contrast to clearly determine the front and back at her ass (there are no contour lines)

[4FunPlayin]

For me switching the spin to the right is harder than switching it to the left. I have a left brain.

[aosma8]

Its got soemthing to do with your left and right side of your brain

[AZUMIKKEL]

I usually see this one as spinning to the right.
But if you imagine her spinning to the left, that's what you will see.

[4FunPlayin]

Woohoo I'm unique!!! I'm the only one that sees her spinning to the left!