eruvin 76

does a window make 2 spaces into 1? depends on size

and the size of a round window

depends on the size of a square window

and how you fit a square into a circle
or
a circle into a square

shabbat 157

taking measures to seal windows

and cancel the words of the wives and daughters

(can a husband or father can annul a wife or daughter's vow on shabbat. and can use a reed to measure and seal a window on shabbat. closing and silencing. for english translation of this talmud page, see here)