I guess.... it seems to just be the effect of your cones resetting.
how did they make that? I can't seem to be able to get the original image from the off-color one.
It's an animated gif - there are multiple frames embedded in the one image. If you take any image and desaturate the color (make it grayscale), and also invert the colors on the original image (blues -> oranges, reds -> greens, etc.) you'll get the same effect like this image shows.
you know what else is cool? any time you see blue at the center of your vision it's an optical illusion. your head fills it in.