You do interact with window every time you clean it. Is it someone else who cleans where you live? If yes and you dont pay them, you should participate in cleaning too.

You do interact with windows every time you check they are all closed before leaving for holidays or weekend. Every time you close it and open it. Most people have small number of rooms and exactly one occasionally two windows in it. We are not talking about how many books you have nor anything like that. We are talking about large visible objects that are few in numbers you interact with fairly often.

Also, the point was not to illustrate point, the point was to diagnose visualization problem based on remembering number of windows.