India, Aug. 7 -- A new optical illusion has been making the rounds online. On first glance, it is just a grid of the word "Tap" repeated several times. But one lone oddball is hidden in it. Can you spot it?

The trick is all in the details. Somewhere in the grid, one entry is slightly different, and you have to find it. This sounds simple, but your brain will skip right past it if you are not really focused. People are calling it the ultimate test of observation skills. Comments like "Only the sharpest 1 in 20 will find it" or "Found it in 3 seconds. or not even close" are popping up everywhere.

So, where is the word "Lap" hidden? It is sitting quietly in the first row on the right or the last row from the left, and specifically in the t...