Tuesday, July 17, 2007

Mindblowing Optical Illusion

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At first glance, the silhouette is spinning clockwise. but you can reverse the spinning.

I honestly thought this was a hoax of some kind and I was being made a fool by staring at this thing trying to make it change direction, and then sure enough, I did it.

Here's what worked for me: Look at the shadow. Notice the shadow of the spinning foot. Try to tell yourself that you are looking at the shadow going the other direction. Once you've convinced yourself of that, look back up (if it helps, cover the girl and only look at the shadow until you can get it to change direction).

29 comments:

Nick Soden said...

Wow, this is seriously one of the best illusions i've seen!! It took me a while to see!! I wonder how it works, or rather, how we trick our minds to see it change directions.

Unknown said...

If you watch closely after about 50 rotations clockwise it reverses to counterclockwise for another 50 rotations. . . there's not mind trick to it. Just watch it closely and you can see when it changes direction. Still really cool though I must say.

Niteowl said...

Er, no, if you rip the animated gif apart, you can plainly see it doesn't change directions.

Just focus on the shadow at the bottom, and imagine the foot moving across the bottom of the picture is going in FRONT of the straight leg, or going behind.

Unknown said...

I must agree with legerdemain that there's no illusion here. And in response to niteowl, if you rip the gif apart, you will only see one sequence of animation (in this case it's a clockwise animation of the spinning woman). However, if you set the animation to reverse (instead of playing frame 1-50, now it plays 50-1) after 50 rotations, that's the effect you're going to get. Simply, there's no optical illusion there. I am a graphic designer and this is quite simple to do.

Daniel Ocampo Daza said...

Then how come I can get it to change direction within seconds (after some practice)? I can also get the foot to spin on its own axis, in the opposite direction of the rest of the body. Pretty cool...

The Analyst said...

Mind thusly blown.

Ha Kohen said...

All you have to do to see that it's a trick is to look at the legs.
At one point it is the light leg coming at you from the right. Then it flashes and it is the left leg coming at you from the left.
Do you think you made her switch legs too?

grouch said...

divon:"Simply, there's no optical illusion there. I am a graphic designer and this is quite simple to do."
A true graphic designer or just a wannabe kid :D

34 frames, open the gif and look for yourself. You'll see how it works.

Head and lower foot are occasionally to opposite directions. The rotating direction is changing, or at least it looks like it is changing. The woman doesn't clearly rotate to any direction - it's an illusion, and the rotating direction is created by your mind. :)

ps. This is very cool illusion!

theRedMan said...
This comment has been removed by the author.
theRedMan said...

it's funny that you guys downloaded the gif and still didn't realize it's a genuine optical illusion. it's exactly like looking at the skeleton of a cube and noticing that you can get the cube to flip from receding into the page to extending out of the page. the reason is you're looking at a 2d image (lines on a page) and interpreting it as a 3d object (cube) only there's not enough information in the image to disambiguate the orientation of the cube. http://www.cs.bham.ac.uk/~axs/fig/cube-only.png
it's the same with the girl. if you look at the images in the .gif, when her chest it to one side or the other, there's not enough information to tell if it's her left or right leg that's extended. when her chest is perpendicular to the plane of the screen, there's not enough information to tell if she's facing towards or away from us.

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Tom Page said...

It's definitely an optical illusion. For those of you who think it isn't, try watching it with a friend. Yo may well find that you think she's going clockwise at the same time as your friend thinks she's going counterclockwise. Also, if she changes direction, it won't happen at the same time for both of you. So this is clearly a psychological perception thing - i.e. she isn't really going in one direction and not the other and she never really changes direction either.

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