An optical illusion can be defined asĀ a way of tricking our brain to see something that is not actually there. Human brain put images together to expect certain things. A 3d illusion tricks our mind to make you think that an object is 3d while it is not. It is generated by a visual system.
Such illusions can be fun and interesting, but they can also be a helpful way to understand some of the different ways that the brain and visual system work. An optical illusion is something that plays tricks on your vision. Optical illusions teach us how our eyes and brain work together to see. You live in a three-dimensional world, so your brain gets clues about depth, shading, lighting, and position to help you interpret what you see.