Pareidolia is when your brain tricks you into seeing meaning in an otherwise plain, innocuous item. Our brains want to seek meaning in everything we see, so when it cannot make sense of the input it’ll give you the best guess.
We see faces in all kinds of things. A random spec on the wall perceived as a spider. The chair with your laundry on it looks like a demon in the middle of the night. Our brains are powerful computers but can still be pretty faulty.