There is a part of your brain responsible for "seeing" and recognizing faces. It's biased very, very strongly to see two dark spots side by side as eyes, a single spot in between and below them as a nose, and a horizontal linear feature below that as a mouth. It's why these work: 😀 You instantly recognize that as not only a face, but a happy/joyous one.

That bias is so strong that your brain gets it wrong sometimes, which is why people see Jesus in their toast, a man in the moon, or a weird abstract right side up dog in a messy low resolution picture of a sideways but normal dog.