Summer is well underway in the UK, and a peculiar natural phenomenon caused by the sun has provided another example of one of our favourite optical illusions. Yup, that mind-boggling hovering boat has been baffling folk once more, and this time it's a crowd of tourists who couldn't believe their eyes.
An astonished photographer captured the moment a cargo ship was sailing well above the horizon line on the normally peaceful Cornish coastline (see below). Can you work how this nautical-themed optical illusion works? This phenomenon is so trippy that we've added it to our roundup of the best optical illusions.
Liam Ball shared the image of the flying boat on Twitter (opens in new tab), and if you've got questions, we're here to answer them. Aptly named 'Fata Morgana', ('mirage' in Italian), these natural illusions happen when cold air sits below warm air directly above the sea. This specific atmospheric condition bends the light and distorts the image. Check out this BBC article (opens in new tab) if you'd like more science-y stuff.
In fact, according to historian Tim Maltin, this distortion could have even caused the Titanic to sink in 1912. "On that occasion the very cold air near the sea caused the distant horizon to appear higher than normal," Maltin told CornwallLive (opens in new tab). "This is known as a miraging strip at the horizon, which appeared like a haze although the weather was crystal clear, causing the fatal iceberg to be seen too late". Serious stuff.
Some believe this mystifying sight is actually the reality behind several different myths (like the Flying Dutchman (opens in new tab)), which wouldn't surprise us given how often this type of illusion pops up. We first covered the floating ship phenomenon in March last year and, just last month, tourists spotted another flying ship on the coast of Cornwall (it's either an illusion, or the Cornish coastline is very popular with ghost sailors).