On the right, he made curtains from a canvas drop cloth. Not only is it a dropcloth, but it was free – we found it in the give-away pile in our warehouse. Then he removed the one window panel that opens. It used to hang sort of open from the bottom with two little chains, like a castle bridge over a moat, effectively stopping any air from getting to us. But he flipped it over so it hinges at the top, then installed a pully system so we can open and close it. There's nothing more fun than battening the rope to the big wooden shelf with knots I learned as a Camp Fire Girl.
The chains that used to suspend the window now tie back the curtains. And of course, my favorite detail: he harvested the cord that holds the window open by gutting and fileting a broken extension cord.
Voila! We have more fresh air, muted sunshine, quirkily mismatched windows and the lasting satisfaction of having made something out of almost nothing.