We are always looking for patterns in things we don't understand on first look.Pareidolia
is where you interpret what you see as something else.
For example, a couple of years back driving home in the dark from work, I swerved to avoid at cat that looked like it was going to run into the road. The same thing happened every night for a week.
Driving down the road in daylight I saw a black bin bag caught in the hedge - it didn't stop me from seeing the "cat" for the next couple of weeks in the road though.