When you look at the picture below, do you see straight or curved lines? That's the debate triggered by the viral optical illusion that's now raging on social media. The image is an eight-by-eight ...

Optical illusions come in all forms, from simple tricks of the eye to complex geometric designs, but my personal favourites are the simple illusions that leave my brain well and truly frazzled. While ...

Challenge your observation skills with this fun visual puzzle that tests how sharp your focus really is. Can your eyes spot ...