Seeing, they do not perceive . . .
In the last couple of years there’s been a fair amount of media attention regarding a phenomenon called “change blindness”, where - employing a technique involving a saccade - a photograph or video is altered, but our brain simply fails to process the change. I’ve prepared a modest example above using Rembrandt’s famous painting, The Return of the Prodigal. There are four changes – do you see them? How long did it take for you to see them? The funny thing is that once you know what they are, the answers are so obvious that you can’t help but see them.
It’s fun to watch the media and blogosphere react to this as if it were a recent discovery, when it was the subject of discussion a couple of thousand years ago.
If you’re desperate, then you can see the solution to the problem here.


The —–, the —– of the —– ——-’s —-, his —- and —– ——- from — —– – time: about one minute.
Correct. Answer edited so it won’t give it away to others