The term "trick of the eyesight" refers to an optical illusion that deceives the eye and makes the brain perceive something that is not there. There are many synonyms for this phenomenon such as optical illusion, visual deception, mirage, hallucination, ghosting, and flicker. Optical illusions occur in different forms and shapes, including geometric illusions, ambiguous illusions, and illusionary movement. These illusions can be created by different sources such as light, shadows, color contrast, and perspective. The study of optical illusions is essential in various fields, including psychology, art, and design. Understanding the tricks of the eyesight can help us learn more about how perception works and how we can utilize it in our daily lives.