Optical illusions occur naturally in different habitats and conditions across the world. Cloud formations can sometimes make it seem like there's an ocean or a UFO in the sky. Whether it is salt flats ...

It’s an optical illusion that has vexed many a weary traveler -- except it’s technically not an illusion at all. This week, we’re exploring the science behind a mirage. * Chances are you’ve noticed ...

Everyone loves an optical illusion — even if they leave us completely stumped — and they're all around us in the natural world. From an underwater waterfall in the Indian Ocean to a surrealist scene ...