I have an awesome illusion below for you guys (And girls!). 
 
For it to work, you must relax, and clear your mind as much as you can. I noticed the more stressed I am, the less it works.
 

This is another example of an amazing illusion!!! The last sentence is so true. 

If your eyes follow the movement of the rotating pink dot, the dots will remain only one color, pink. 

However if you stare at the black '+ ' in the center, the moving dot turns to green.
Now, concentrate on the black ' + ' in the center of the picture. After a short period, all the pink dots will slowly disappear, and you will see only a single green dot rotating. 

It's amazing how our brain works. There really is no green dot, and the pink ones really don't disappear. This should be proof enough, we don't always see what we think we see. 





Some more fun below!
 

Do YOU see Monroe or Einstein? Check If You Need Glasses at Your Computer
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Some people get used to seeing things in a certain way so that they ignore a progressive vision problem. Causing many to squint a lot, and end up with unnecessary eye strain at their computers.

Do you see Albert Einstein while sitting a normal distance from your computer? Then you are seeing things as you should.

Do you see Marilyn Monroe?
Then you should probably be wearing glasses or contacts.
 


This is not a .GIF  If you don't believe me, look at one particular spot, and you'll notice it never moves, but if you look at the whole image, then it will look all weird, and bendy. 

awesome!!!!!!

I posted two more images in the OP. Pretty amazing too!

i have to try this once i'm drunk

Marilyn Monroe with a moustache...and thats WITH my glasses. Time for my yearly eye exam I guess.

It's all about wearing out your rods and cones. Just like if you star at a small light in the dark, soon it will almost disappear.

Glasses on I see Einstein, far away without glasses I see Monroe. 

i've never seen marilyn with a stouche before although it's a picture far from looking like marilyn.

I saw marilyn, my bad vision is useful now!

haha this is fun stuff, I am near sighted and I saw Marilyn Monroe xD!
But yer that bendy image, that was really kool! Reminded me if you had too much Ganja haha
 
Here a few cool ones I found :)
 
Mesa see wheels are a turning

 
Sailing ships or abridge?

 
More odd turning stuff:

 
This is weird!

 

here is one with circles XD

XrayMan

 
              

Huh? 

Man, things move like this for me when I stare at anything for too long.


 
 
And that's what I see when my GF bends over!

EliteGeek91

XrayMan


             

Huh? 

Photoshop
This is a 15 minute or so edit