Optical illusion happens when the images that are visually perceived in a different ways than the objects are in reality. The information that our eyes gather about a particular object gets processed by the brain. The brain then gives the perception of the object in such a way that it does not match with the actual object giving optical illusions. There are different types of optical illusions and in our daily lives also optical illusions are experienced. Optical illusions have been used by the artists since many centuries though some of them were in the hidden form. Optical illusions are getting used in the modern time for various purposes. It could just be simple fun or to attract viewers towards a particular product or service of a company. Many shopping malls keep the optical illusion art works to attract visitors. The scary optical illusions could be meant for fun or can be used to make viewers aware of the dangers ahead. In most of the scary illusions, the viewers are instructed to look at a particular point on the picture and then to blink the eyes for a few times so that the effect of the illusion is experienced very well. After looking at the image for some time, if the user looks at the side wall the same image seems to appear there. All these frightening and realistic optical tricks are created by the use of EMS-eye motion sensitivity and using the technique of heavy color contrasts.