More technically, pareidolia is “the illusory perception of meaningful patterns or images of familiar things in random or amorphous data, as a face seen on the moon.”

Even though it’s something all people have, not much is known about the phenomenon. Neuroscientists have some understanding of where it can happen in the brain and are sure that it’s an evolutionary skill that was valuable for us in the natural world to identify faces and other threats.

Most commonly, people spot faces and animals in inanimate objects. Our hypersensitivity to detecting faces even has its own category of pareidolia—face pareidolia. In a sense, it can be considered a side effect of our ability to quickly identify human features. This efficiency in detecting faces can sometimes make us see them when they aren’t there.

Interestingly, making out objects on the moon’s surface also has its own category: lunar pareidolia. People often see light and dark patches of the moon and interpret them as familiar shapes. In some European countries, people see a ‘banished man’ carrying a bundle of sticks, while in Asian cultures they observe a rabbit.

Hermann Rorschach was also inspired by people’s ability to see meaning where there isn’t. His Rorschach inkblot test, where people are influenced or guided by specialists to see things in ink splotches that reveal their unconscious thoughts, is an example of directed pareidolia. This test is still used in practice by some psychologists to diagnose schizophrenia.

Despite many optical examples, pareidolia isn’t limited to visual perception and can also happen with sounds. It occurs when we misinterpret bird songs, white noise, or running water as human speech. We also can mishear lyrics or words that don’t exist.

Generally speaking, pareidolia is a type of apophenia, which is a broader term for finding meaning in random data. It’s our human nature to make connections in a world that can feel chaotic and out of order. However, when it becomes extreme, it can be a sign of mental illness like bipolar disorder, severe depression, and schizophrenia, which make people lose touch with reality.

At the same time, experts see a positive side to apophenia and pareidolia. “We think pareidolia may enhance focus, creativity, and innovation because you’re seeing things in a different way. If this turns out to be the case, building pareidolia skills could be very useful in helping to solve problems in many areas of society,” said Susan Magsamen, director of the International Arts and Mind Lab at the Petersen Brain Science Institute.

“Often we underrate different ways of interpretation or unique perceptions,” she continued. “Think about all the problems that you could address by having better ability to interpret ideas and learning how to communicate and collaborate more effectively. Could something as simple as pareidolia be a tool that could help do that?”