text: Some of the biggest tricks played are constructed by the eyes. When the first image of the face on Mars was revealed, the features such as the eyes and nose were most likely created by shadows. In the article it explains, "A few days later NASA unveiled the image for all to see. The caption noted a 'huge rock formation...which resembles a human head...formed by shadows giving the illusion of eyes, nose, and mouth." This excerpt from the article explains that the only reason the natural landform even remotely looked like a face was because of shadows.