Pareidolia is the human ability to see shapes or make pictures out of randomness. It’s like the Rorschach inkblot test or that commercial where that dog only sees bacon. In this case, it’s anything.
There’s an entire subreddit dedicated to this phenomenon where people share pics of things that look like other things…usually faces.
It’s just nice to know there’s a name for what happens when I think someone is standing in the corner of my bedroom in the middle of the night, just to tackle my coat rack.