Optical illusions have a mystical ability to challenge not only our vision but also our patience and our ability to notice details. At first glance, what you're looking at looks to be nothing more than a group of mischievous little ghosts, all with distinctive facial expressions and ridiculous accessories. They're packed so tightly together that it seems impossible to notice anything else tucked away among them. But don't be deceived, hidden somewhere in this confusing ocean of white blankets is a stealthy polar bear. Yes, here it is, disguised as well as can be among the specters, a bear is concealed in plain view. Your task is to find it within 10 seconds.

Credits: Brightside
The reason that this illusion is so deceptive is the adept interweaving of forms and colours. Both ghosts and polar bears have a snowy white colour, and the artist has taken advantage of this similarity to trick your brain. The mind is conditioned to seek out known patterns; as we are expecting ghosts, we overlook the one figure that is not one of them. The polar bear is not dramatically different, its facial structure, nose, and ear shape, but if you don't slow down and scan well, your eye will probably miss it.
The key to solving this puzzle is to look at the picture methodically rather than having your eyes make random scans.
Look closely at the faces, as the polar bear's nose and black nose will be the largest giveaway. Some like to scan it from top to bottom like reading a page, while others divide the picture up into sections and work on one small group at a time.
Then, set a timer and challenge yourself. Can you beat the statistics and catch the secret polar bear before the seconds tick away? Win or lose quickly or slowly, the excitement of revelation will be worth it.
The answer to this optical illusion is given in the picture below.

Credits: Brightside
Each time when you crack an illusion like this one, means you're honing your concentration and observation abilities.