aww man, Da_Goat Ya ruined it. LOL. yup, thats where i got it from. Its a great site with hillarious flash animations and prank fone call .mp3s
anyway, i believe TD said it correctly.
the image you see when you blink your eyes IS the exact same picture you are lookin at on the screen, its just that somehow, when your eyes get tired of lookin at the picture, it seems to "burn" it into your sight temporarily. Im not totally sure as to y the colors get inverted tho, but perhaps if you photocopied a bunch of Math formulas and changed the background to black and the foreground to white, and stared at it for an hour before the test, and didnt stop starin at it until the test, maybe you could get them burned in long enuf to help you out!
Richard