This optical illusion of a brick wall that is confounding the internet may leave your brain smoking after a few minutes.
It just looks like a simple brick wall with nothing too special about it, but there's something more depending on how you look at it.
The illusion was posted on Facebook by Arron Bevin from Manchester, England, who said it took him "a good 5 minutes" to figure it out.
Judging by the more than 50,000 comments on Bevin's post, many people were not able to figure it out at all or were jokingly cursing Bevin for making them take 15 minutes out of their day to finally see it.
People online have also been bedeviled by it.
Solving it has provided sweet relief for others. Once you see it, you can't un-see it.
Still don't see it? Maybe when you do, you can celebrate with a victory cigar.
Follow TODAY.com writer Scott Stump on Twitter.