Skull Optical illusions are kind of anamorphism where the object is presented in the distorted manner but when looked at from a particular angle, it is perceived by the viewer into a different thing. Many famous artists have used the optical illusions in their arts sometimes they did not want the viewers to take notice of it and at times they did it with a particular purpose. Famous Hungarian artist Istvan Orosz has used the optical illusions in his art in such a way that the paintings will always have a hidden human skull. All his works had the presence of human skull though in some of his works, the presence is obvious but all his skull optical illusions are superb. These art works will trick the viewers as they will think that they are looking into a drawing with a theme of medieval period but actually there is a human skull that is hidden in this drawing. These optical illusions render a great on the viewers and there are many advertisement agencies that are using this form of illusions to give their message effectively to the people. When the ad agencies are asked to create the eye-captivating and impressive ads meant for public such as to make them aware of the effects of AIDS, smoking, drug use etc, there cannot be anything that is more effective than a skull optical illusion used in an advertisement. The people who look at it are compelled to read the campaign and find the message behind the poster.