ooo I read about this and it was very interesting.

Apparently, cats are not 'self aware' so they will always think it is another cat. You can tell this if your kitty looks for the other cat behind the mirror. You can also test this further by putting something on your kitty (I used a sticker) and seeing if they notice the cat in the mirror also has a sticker on.

We lay the full length mirror on its side. Waffles runs up and down it doing wicked ninja jumps