Well, I don't quite know what you thought the 15 or so bricks in the picture were doing, if they weren't part of a wall! Know what you meant though - you saw it as something sticking out of the wall straightaway; as I did.
Think I've just wasted several minutes of my life on it though! To be...
OK, the explanation (rather than suggestion) was fine then. It does look a bit like a bit of rusty metal too. But as you say, there is no optical illusion, so a bit emperor's new clothes really.
My first thought was that it was a bit of rusty metal sticking out. But the suggestion that it was a cigar (well, more a cheroot, I think - don't cigars bulge a bit in the middle?) was fine too - it could be ash on the end, rather than just an unusual bit of decay and discolouration.
Thanks for trying, but that's no spoiler at all. I'm one of the 36% of people who've checked that link that can't see anything except a wall.
So can you tell us in plain English what it is that we're supposed to see? Or maybe the joke is that it is just a wall?
Right, this thread has been around for long enough now, so time to 'spoil' it. So will those clever sods who think they can see the emperor's new clothes kindly explain it to those who believe that a group of bricks such as depicted generally can be classified as 'a wall'?