IntroductionThe goal of this experiment is to identify who has more impact on the McCollough effect, boys or girls, or whether the McCollough effect really works. We are interested in this topic because optical illusions fascinate us and the McCollough effect is one of them. We also want to know if it works because, interestingly enough, some test subjects can't see the effect, while others can. We wonder if a test subject's gender affects how they perceive this optical illusion. Vision helps us navigate the world around us more than any other sense. In a fraction of a second, our eyes work with our brain to tell us the size, shape and texture of an object. They also tell us how close it is and whether it is stationary or moving. The structures of our eyes are incredibly complex, despite being small compared to the rest of our organs. Human eyes are extremely delicate. The visible part of the eye is protected by the eyelids and eyelashes, which keep out dirt, dust and harmful bright light. The eye is made up of many different parts that help us see. The first ...