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 অথবা a window with sunlight coming through it). আপনি should see a white বৃত্ত with an image inside it.
আপনি don't nessasarily need to watch this all the way though but on pause it at 4:46 a floating shadow can be seen 5:09 a man/figure can be clearly seen when the camera goes back a mere সেকেন্ড later the man/firgure is gone
