So I called Athena over so she could see, and then Page saw us both looking out the window, so she wanted to know what all the fuss was about. When we pointed out the other cat to her, she seemed interested, and her tail didn't go all bushy defensive mode. She was, however, still very jumpy. Sometimes, I wonder if Page would like another cat to talk to, so I thought it would be nice if they made friends. Page took her position by the windowsill, and our guest maintained its position.
...Then we finished breakfast and brushing our hair, and we had other stuff to do, so we left. Page followed us, so I figured I didn't need to try opening the door to see if they wanted to interact more closely (although we're pretty sure the other cat would have bolted as soon as the door moved an inch). And by the time we got back to the living room, the other cat had gone, so we weren't able to get a picture of it. We decided to call it Envy, because of its striking green eyes. Then we thought it would be cool if we could come up with a different name with the initials NV, so we could call it Envy without naming it after such an unattractive character trait (even though in this case, it would have just meant "green-eyed monster"). And then I remembered that in most Latin-based languages, "our" starts with an N, so if we could find a translation for "visitor" in Spanish or French or Italian that started with V, we're be good to go...and then we remembered that all nouns in those languages have a gender, and we wouldn't know which one to use, so we gave up on the whole idea.
Anyway, we're suckers for novelty, so we hope that cat comes by again.
Today I'm thankful for feline visitors, the Daisy Tsum's adorable skill (it turns other Tsums into Donald Tsums! and then when you clear the Donald Tsums, there are hearts everywhere), having more salted caramel blondie bites, being done going to the grocery store today, and reusable grocery bags.