Our cat in U.K. Elsie, understood mirrors perfectly. She would position herself where she could see the staircase through our mirrored wardrobe doors and wait for poor old Ginge to come up the stairs. As he turned into the bedroom, she would pounce and he would leap into the air in shock. He wasn't the brightest cat, bless him and it got him every time.
It's a great pity the right of free speech isn't based on the obligation to say something sensible.