Optical illusions are images that deceive our brains, making us see something different from reality. They occur when our visual system interprets information in unexpected ways, often due to the arrangement of colors, shapes, and patterns. This can lead to perceptions that differ from the actual physical properties of the objects being viewed. There are various types of optical illusions, including geometric illusions, motion illusions, and ambiguous images. Each type plays with our perception, highlighting how our brains process visual information. Understanding these illusions can provide insights into the complexities of human perception and the workings of the visual system.