India, July 4 -- Optical illusions are always fun, right? An image going viral on X (formerly Twitter) is making netizens scratch their heads. At first glance, the photo looks like a purple grid packed with identical codes. But look again. It is not all "2E3". Somewhere in there, hiding almost too well, is the odd one out - "2F3". Yes, your job is to find it.

Sure, it sounds simple: just find the one thing that does not match. But our brains do not always cooperate. The letters "E" and "F" look quite similar. Especially when printed in the same font, size and style. That tiny horizontal line in "E" is all that separates it from "F", which is why this illusion works so well. It tricks your eyes and your brain into skipping over small diff...