Michael feels driven to count the squares in the bathroom tile. he has very rigid rules regarding how he ritually counts them and how this behavior should be performed.

The answer is compulsive behavior. It is defined as executing an act determinedly and repeatedly without it essentially leading to a real pleasure or prize. Compulsive behaviors might be an effort to make fascinations go away. The act is typically a small, limited and repetitive behavior, however not troubling in an extreme way.