The eye is something that we tend to take for granted, although most of us would probably give up any other of our senses before we give up our eyes. After all, we use the information that is provided by the eyes on an ongoing basis to give us guidance and help us make decisions that will walk us through life. We may not realise it, but it is always happening.
Sometimes, we are able to discern the things that we see very quickly. In fact, it is estimated that it takes less than 1/10 of one second to process the information that is taken in by our visual senses. Unfortunately, our eye may need to take a shortcut from time to time because it is unable to keep up with the processing of that information. That is when optical illusions occur.
When you look at the sea of letters in this image, you will see that they are all the same. That is, of course, except for the one letter that is different than the rest. Most people are going to have a difficulty finding it but if you can find it easily, you might just be a genius.