Yet another optical illusion is baffling the Internet – and this one has had people staring at their computer screens and smartphones unit they got it.
At a first glance, this picture looks like your fairly typical brick wall but it hides a secret that once seen, cannot be unseen.
The question is – can you see anything unusual about the picture? Does anything stand out?
Most people studied the picture, which has suddenly gone viral after first turning up on Spanish websites in 2014, and decided there was nothing out of the ordinary.
But look again – is there something hiding in the wall?