Of course, this floating city could also be an elaborate hoax, the product of digital manipulation.

A giant ghost town was noticed in the sky of the Chinese province of Foshan on October 7, as reported by the Daily Mirror.

Onlookers, a few who are said to have videoed the weird event, were said to be mesmerised as a towering city of sky scrapers appeared from the clouds.

A supposed floating city in the clouds above China reportedly stunned thousands of residents in Jiangxi and Foshan recently, causing them to snatch their cameras and document a phenomenon that weather experts believe is merely a Fata Morgana optical illusion.

One of the most interesting theories claims that American agency NASA is planning to use “holographic image projection technology” to simulate the second coming of Christ or an alien invasion and gauge people’s reaction to it.

In a 2014 study, Michael Hall, from Griffith University, and colleagues suggested of a quantum theory based on the idea of interaction between parallel universes.

Because the brain puts the object where it would be if the light traveled a straight path, the distant skyscrapers appear higher than they actually are.

Less excitingly, weather experts said the cloud formation was the result of a natural phenomenon called Fata Morgana, a type of mirage which distorts objects as a result of atmospheric and temperature changes.

Skye Gould/Tech InsiderThe floating city mirage wasn’t because of secret government tests, aliens, holograms, or parallel universes - just really cool science.

There were previous reports of a similar sighting in China in 2011.