heh. Now I wish it was so I could discover what a ro-sham-bo is. Sadly, it's legit. It's weird, at first you can't see the difference, then you wonder why on earth you couldn't see it straight away.
I have a theory it's easier if you're further away from the screen if anyone would like to try it and say roughly how quickly you spotted the changes.
When you're going through hell, keep going. Winston Churchill
I got the ones where there was an actual object missing quicker than the ones where the colour or shade of something changes. Some I got straight away and others took ages. I can't believe how obvious it is once you know what it is.