When you look at an optical illusion, like a straight and curved line or a moving object that is still, you might think you see things. You start to believe that your eyes are tricking you. You do not see things. An illusion shows that you don't always know what you think you are doing. This is because of how your brain and whole visual system receive and interpret an image.
And now, in the age of Photoshop, we see all kinds of photos that have been changed. Most of the time, when we know what went on behind the scenes of an image, we can't believe what we see because the before and after of a photo are so different. When that happens, we only want to wash our eyes with soap and look again. Here are some great examples. Look at them by scrolling down.
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