Optical illusions have recently sent the internet into a tizzy, as they get our brain to exercise, and can be the perfect test of our observational skills and keen eye. They are also super fun to solve, and can be the perfect recipe for a bored evening! An optical illusion is actually a visual phenomenon where the brain misinterprets what the eyes perceive. It occurs when the information sent by the eyes conflicts with how the brain processes and understands what it sees. These illusions often trick us into seeing things that are not there, or perceiving objects differently from reality. For example, a still image might appear to move, or two shapes may seem unequal in size even though they are identical.Can you spot the “different” dinosaur in this pic?In this picture, we see similar looking dinosaurs standing. All of them seem to be same to the naked eye, with the same color and size. However, there is one sneaky dinosaur who is different from the others. Can you spot it? But remember, you just have 10 seconds to do so! Can you do it? Your time starts now!The revealGive up? Look closely at the second last row from the bottom, and you will be able to spot the dinosaur. Did you? Let us know in the comments section.Types of optical illusionsThere are three main types of optical illusions:Literal Illusions: These occur when the brain combines elements of an image to create something that doesn’t exist. For example, an image might look like two faces or a vase depending on how you interpret it.Physiological Illusions: These are caused by overstimulation of the visual system, such as excessive exposure to light, movement, or color. They can create effects like afterimages or motion illusions.Cognitive Illusions: These rely on how the brain subconsciously interprets information. Examples include illusions like the Müller-Lyer illusion, where lines appear longer or shorter due to surrounding shapes.