Solution:

Of course there is an odd one. It's quite good if you got to the result in the first look only. Give yourself a tap on your shoulder. Many people will not be able to separate out the odd one in the first go. This is because the rest are the same due to which our mind perceives the odd one as the same too. These type of illusions become more evident when a lot of figures are included. We have just added four rows to ease out on you.

Solution:

This illusion is the proof of how smart our brain is. In the first figure, the three circles are cut and placed in a manner that we can easily trace a triangle on the top of them even though it is not there. Similarly in the second figure, we can make out a sphere on which the spikes are grown. It's awesome right?

Solution:

The big square is a real square with straight lines. The same can be said for the mini squares created by the lines inside the square. All the lines are perfectly straight and parallel (vertical with vertical and diagonal with diagonal). The diagonal lines in the middle makes those straight lines appear distorted from the middle. However you can see that it is actually not after removing the background.

Solution:

The distorted lines in the background are the culprit behind the distortion we see in the squares. But if we remove those lines, you can see that these are actually three true squares with perfect straight and parallel lines.

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