This video is a little bit long..but it's definitely worth watching. Scroll down a little bit and it is the first video on the page by Al seckel. He is a scientist who does extensive research on visual illusions and how different people perceive them and so forth. He makes a point of showing how things that look the same can become very different by a simple change. Our brains really don't need a lot of information to make something different from another. Another very interesting bit- He shows an image of a cross with two balls crossing over one another. He does it the first time with no noise, and the second time with a little sound effect. Now, the balls seem to be bouncing off one another, however they are in fact doing the same thing as they were the first time. Just by hearing this little noise our brain sees it as being different and our visual perception changes. Definitely make sure you try to watch the whole thing, there are definitely some funny parts to it as well. Especially the little girl drawing the picture of her mommy "pole dancing" and the true meanings behind all of these examples.