Kitty Visitor, or, How Callie Learned About Windows

[steuard]

For the past half hour or so, Callie has been absolutely fascinated by a visitor who showed up on our porch:

Disappointingly, interacting with the visitor hasn't been as easy as she'd like. Not only does the strange cat not respond when Callie gets up into her attack poses, but any attempt to follow through on that threat with a paw or a leap is blocked by some sort of hard, invisible wall.

Somehow, I get the impression that this new cat understands windows a bit better than Callie does. (Polly has started to express interest, too, but she has yet to try to fight through glass.)