Instead, I thought I'd close the open window. But here's the thing: the cat was sitting in his cat hammock, looking out the window and enjoying the light breeze. (He wears a permanent fur coat after all.) I wanted the window closed, but I knew it would displease the cat. I thus compromised and closed the window partway, leaving just enough room for a cat's head.
It's clear who is in charge here. He didn't even ask me to leave the window open -- I just knew he'd be unhappy otherwise.