Here's an excerpt of my journal, from earlier this year:

ENTRY 3.7.E.3 - Rivulet, Caught On Overseer!

While reading through my pearl data archives, my attention snagged on this particular one. The pearl is described by Moon as- *reads more* -containing an image of a blue slugcat. We can all name one blue slugcat, and only one. In a Garbage Wastes broadcast, Pleading Intellect sends a picture of "one of those resourceful, wandering ones that go in pipes" to Wandering Omen. Seeing the pieces coming together?

CONCLUSION: Rivulet must be quite the wanderer if one of Pleading Intellect's overseers got a picture of them!