"Oxen" is the plural of "ox". "We" is a plural pronoun and the subject of the sentence.
Oxen.
World Outside Your Window was created in 1989.
World Outside My Window was created in 2001.
Outside My Window was created on 2009-06-29.
The windows.
windows
You can open the window, and look outside.
It's about as plural as can be, except there is only one building and only one window ledge.
Window = Singular Windows = Plural
outside edge of a window used to change the window size
Seven cats meowing outside your window.
The aisle seat is inside, window seat outside.