Knowledge

Facts, science and history of optical illusions.
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Parallax Effect

Ambiguous illusions

Inferior and Superior Mirages, and Fata Morgana

Separation

Credit: 大野健一

This photo is not a composite, but rather zoomed in until it is hard to recognize what you are seeing. The orange color on the right is a retaining wall.

After the photo won the 39th Asahi Photo Contest in 2023, it went viral online.

More optical illusions:

Black hole

Sword-billed Hummingbird

Wind turbines

Hidden ad in advertisement page

Back to School

Transparent coffee cup

A Galaxy Far Away

In Search for Water

This photo is upside down. It is a nearly submerged SUV in a lake with many bystanders. After this image was first posted to Reddit in January 2020, it has become a popular meme with the caption: "The difference between a UFO and a female driver is 180 degrees."

180 degrees

Cars

Three little pigs

a dirty mind