This puzzle looks straightforward, but it is more complex than you think. The figure of 45 is concealed in a grid of two odd numbers: 54 and 55. Can you spot them within 5 seconds?On initial observation, all the figures seem the same. That is why our brain is programmed to detect patterns quickly and naturally to fill in the gaps. With the same-looking figures, such as 4 and 5, coming in succession, it becomes more difficult for our eyes to detect a slight difference, such as a 4 replacing a 5.It is an optical illusion that challenges your eye, eye for detail, and visual wit. It appears as though it is a basic puzzle game, but these drills are applied in mind training to hone concentration and acuity of mind.How to do it Look from left to right, top to bottom.Don't be distracted—look out for something that seems out of the ordinaryTake your time examining the direction of the digits: "54" and "55" flow differently than "45."Found both of them yet? If so, try again without rushing. This isn't just a test of your vision—it's a test of how your brain perceives this image.