The whole trick here is the use of a technique known as retinal mixing. It is the nature of color to react to surrounding colors. This means that the color we think we see depends entirely on the entire color scheme used around it.

What blue? I don't see any blue. *twitch twitch*

Arr..whenever I look at the green, the green I'm not looking at is "blue," and when I go to look at the "blue," it turns green! @.@

who ever caffenated-cat is...you're not alone! That's what happened to me too!

me too! oh man, my head hurts

*o* whooooooooooooaaaaaaaaaaaaaaaaaaa............

oh... that's cool! But I thought that they were two different shades of green, not green and blue. And to me, the pink looks purple. Is that the illusion or just my eyes? lol ;)

agree with rayne. 2 diff shades, but if u put ur head a bit away from the screen, orange seems 2 be pink, and pink looks purple, or is that just me?

i tried that myself on paint and it works there 2!

huh???????? i don't see anything...but the orange on the pink looks pink if you back away from the screan. Am i right????

wat? i dont see anything,,, i mean the blues or greens. i dont get it

THERES NO BLUE

get closer to the screen, and you'll see why they are the same color

WHAT?., blue?, either i am coulorblind or i am not seeing it right!,, it just hurts to look at!!

I dont see it.

I get it, its very good

omg!!! it freax u rite out & makes my peanut brain hurt suverly owwwwww!!!!!!

seen something like this b4. pretty cool. made my eyes hurt trying to focus on the stripes though X[

Ooooo-La-La! :)

That's trippy.

ahh i got a headache n dizzyness AAAAAAAHHHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!

*_*Wow...I♥Optical Illusions!

wat i dont even see a blue colour

copy this picture and then paste it using paint and there is purple red AND green

Confusing! I have a headache!

yeah. i find if i focus on the blue/green lines. they all appear the same colour after a few secs.

Amazing what the eyes can see

At first i didnt know what it was talkin about. But after lookin at it like 3 times, i finally seen it.

If you look at it full size the colors look the same.

If you are drunk while doing this, you may only see Red.... Well... CHANGE THE PICTURE BEFORE YOU GO BLIND!

Its usual but amazing like magic: Choose a white area on your pc/tv screen, take a magnifying glass, and zoom it. You will see only coloured points, none of them white. Where is white color? It must be there, in fact! As you close the glass to the screen, points get smaller and voilà, white color appears when eyes mix all small colors. Your neurons think their own way, and many times you don't notice it!

I can't see the blue!!

Dont see an illusion
just blue, green, purple, and orange stripes

i know how it works, but its still kinda cool.

Meg is right i dont see any BLOOOOOOO!!!!!!!!

THIS IS WELL KOOL. I LUV DIS SYT ITS AMAZING!!!!!

I feel dead sick just looking at it again

I don't see anything! just those same colors! O.O

OMFG!

Cool, I have great pictures of EPCOT (Disney World) and their beutiful (very) green gardens. I'd read somewhere that Kodak had desingned a special color pavement paint so the grass would look greener and, until today, coundn't understand how.