Let us examine its whole evolution history (image get from http://www.vividict.com)
|Learn one Chinese Character a day - 宀|
|a typical house|
Eventually was simplified to 宀.
When you see any Chinese character with 宀, that character must be related to house, like 家, 室 and etc.
Now let us enjoy a Chinese calligraphy with a Chinese character which contains 宀.