They call it the "Flashed Face Distortion Effect". It seems really simple...but it still blows my mind every time I do it. It really gives you a good idea about what's going on in your subconscious/imagination/whatever.

It works like this. The video starts with a face on each side of the screen and a cross in the middle of the screen. During the video, the faces will rapidly change to other faces. The faces are simply a bunch of different people with different features...but none of the face have been altered. All you have to do is continue to look at the cross in the middle of the screen. Having said that, it's not necessarily that easy. Once the faces start changing you'll be really tempted to look at them. The reason you'll be tempted is because your is gonna start to tell you that you are seeing some really messed-up, monstrous looking faces (if the illusion works on you). And I think it helps if you make the video full screen.

Enough explanation...just try the damn thing...and let me know if it worked on you.

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