New Delhi, July 20 -- Optical illusions are not merely tricks or viral brain teasers, they reveal the curious disconnect between what we see and what our brain interprets. A flat drawing might come across as three-dimensional, a still image might appear to move, or colours can trick the eyesight into seeing motion which does not even exist. Scientists study these quirks to unravel how our brain works, but many illusions continue to confuse even the experts.

As Merriam-Webster defines it, an optical illusion is "a misleading image presented to the vision." However, as per Live Science, some experts argue they're better termed "visual illusions." Here are five optical illusions that prove how your brain can be misled by simple visual cues....