This one’s so simple, yet so hard to see if you don’t know what you are looking for. I haven’t spot the optical illusion until I read the solution that came with it. Don’t worry, it’s nothing abstract. Just when you spot what is hidden in this image, you won’t be able not to see it after that anymore – ever. Even if someone showed you this very same image years from now. Most of the similar ones were linked in our previous Mystery Dots article, so head there if you liked this one. I can give you a slight hint, though. Check this category to adjust your way of thinking