The mice clean the house.
The mice in the house are there to clean it. They are robot mice that stay in the walls. The house is a fancy automated house.
Out of warrens in the wall, tiny robot mice darted. The rooms were acrawl with the small cleaning animals, all rubber and metal.
In this future year of 2026, the house takes care of its ow maintenance. It makes breakfast for its inhabitants, cleans itself, and acts as a kind of smartphone. It keeps your calendar, is your alarm clock, and tells you the news.
The irony of the little robot mice is that we usually associate mice with filth and disease, not cleanliness. The mice also move about in a futile manner, over and over. The house is clean. There are no humans to mess it up. The house is self-sufficient, and it doesn’t know.