You must be familiar with the people in these two photos, you should be able to see at a glance, this is the social media star Musk, but the photos are upside down.
You might be wondering, what are you doing with these two pictures, and what's so strange about it?
Well, you just turn the photo upside down and you know, what? Don't know how to turn the photo upside down?
It's simple, lock the phone screen, don't let it rotate automatically, just turn the phone upside down.
At this point you can see the strange phenomenon, which is an optical illusion, known as the Thatcher effect, because it was first named after the photo tampering with former British Prime Minister Thatcher.
Everyone's face is unique, and our brains use eyes, nose, and mouth as the main features when judging who a person is, and even if some features change when the image is inverted, it can deceive our eyes and make it difficult for us to find.
The most amazing thing is that not only do humans have this phenomenon, but there is evidence that rhesus monkeys and chimpanzees also have a Thatcher effect, which proves from another aspect that humans and them evolved from a common ancestor.