It is a small gap, but that is exactly what makes the puzzle effective. The image gives us a strong clue: the numbers are arranged in familiar order. That orderly layout encourages us to expect the next number before we have actually checked it. If we glance quickly, our minds may silently supply the missing 46 and move on. We may feel that we have read every number when, in fact, we have followed the
Viral Test: Which Number Is Missing?
