The details distract your brain from seeing the underlying image. When you squint you can't see details so brain can suddenly see the hidden image.

People have made these before but AI is just 100x better at hallucinating in details so the effect is really strong.

You ever been barely awake and see a coat on a chair and jump cus your brain says there’s a dude standing there? It’s that.

Since birth our brains are wired to look for faces. It helps with survival when the helpless wiggly thing bonds with the giant who is full of hormones telling them to protect it.

As we grow we learn to recognize other patterns, which help us find food, be safe, find a mate, etc. Our brains are constantly looking to match everything we see with something from a previous experience. Which is unfortunately one of the places PTSD can pop up. Say you had a traumatic experience - you may not remember seeing someone wearing a red hat just prior to something terrible happening, but your brain might. In the aftermath it's possible that you find yourself uncomfortable around someone wearing a red hat but can't figure out why. You may not remember, but your brain does and thinks it's helping by alerting you too a problem.