Optical Illusion: Netizens say they had a hard time finding the odd letter in this image, would you like to try?

This optical illusion has gone viral over social media and has left people scratching their heads. Netizens have found it difficult to attempt this challenge as they say they were unable to concentrate on the image for long.

So, are you ready to take the challenge? Before that let's know why optical illusions should be a part of your daily routine.