Afterimages (sometimes calles ghost images) are optical illusions that appear in one's vision after the exposure to the original picture has ceased (eg. the bright glow after looking into strong light). This persistence of vision allows a rapid series of pictures to portray motion, which is the basis of animation and cinema.
A few famous afterimages include illusions of Jesus, Che Guevara, US flag or Italian flag.
JESUS ILLUSION
Stare at the four black dots in the center of the image for 30 - 60 seconds. Then quickly close your eyes and look at something bright (like a lamp or a window with sunlight coming through it). You should see a white circle with an image inside it.
CHE GUEVARA AFTERIMAGE
Stare at the image for at least 30 seconds and then look at something white to see Che Guevara afterimage.
GIRL
Stare at the red dot on the girl's nose for 30 seconds. Then look at the ceiling (or any white surface) and blink really quickly a few times. You will be amazed to see colorful girl.
ITALIAN FLAG
Stare at the image for at least 30 seconds and then look at something white to see Italian flag afterimage.
US FLAG
Stare at the image for at least 30 seconds and then look at something white to see US flag afterimage.
COLOR CITY
Stare at the red dot in the middle for a few seconds. After the time runs out, you'll see colored town while there is actually only black and white.
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