But! The following day, he vanished. I looked around for any holes that he could have wiggled out of, couldn't find any. Later that night, he was back again.
Now does that sound like he's found a door into an alternate universe or what?
I discovered that there could be another answer when a mouse ran out from behind the rack where I keep the coffee cups. Toby changes into a mouse to go traveling, or when he gets bored.