A viral optical illusion is challenging social media users’ perception, and most viewers can’t spot the hidden secret. At first glance, it appears to be a simple drawing of a sailor gazing out to sea—but there’s a twist: the face of his wife is cleverly hidden within the image. Optical illusions like this trick the brain by manipulating patterns and expectations. Our minds naturally fill in gaps, which is why many people overlook what’s right in front of them.