At first glance, this puzzle seems almost too easy. A grid displays numbers in order, beginning with 1 and ending with 60. The challenge is simple: look closely and find the number that has been left out.
Yet many people scan the image several times without noticing the answer. Why? Because the sequence looks familiar. Our brains are quick at recognizing patterns, and once we believe we know what we are seeing, we may read the numbers as a sequence rather than inspect every one individually. The gap can hide
