Optical illusions are visual images that trick our brains into seeing or perceiving something differently to how it is in reality.

They are a great way to keep your mind sharp and focus on attention to detail. For example, a picture might appear to be one thing at first glance but, on closer inspection, turns out to be something else.

While some brainteasers make us second-guess ourselves, others are as simple as using a different colour – remember the viral dress that confused everyone as to…