Our eyes naturally skim patterns. When every cell shows the same three digits, the mind quickly assumes uniformity and stops checking closely. Psychologists say this is tied to “visual search fatigue, ...

The trick here is that your eyes get used to the pattern right away. Once the brain sees row after row of the same figure, it stops searching for anything unusual. That is why the odd number blends in ...

Spot the hidden number of Ms: An optical illusion changes or confuses when you see within seconds, which is tricky and challenging too. It will be interesting, but it will make you scratch your head.

The trick lies in repetition. Once the brain sees the same number appear dozens of times, it stops paying close attention. Psychologists often call this “visual fatigue.” Your eyes are scanning, but ...