Optical illusions are fun and some are just flat out freaky. Sometimes you might wonder who comes up with these things, but either way they are a lot of fun. It is amazing what can appear to happen simply by looking at something. This illusion is a great example. All of the gray bars will cause visual distortion thus creating a strobing effect that makes the water appear to actually flow from the faucets. To see this illusion from yahoo.com, click here.