Perhaps it sounds silly, but I actually found the site through the green tags! I was thinking about that one thing you see in some shows where something gets destroyed and they show that by having it break apart into cubes. I was delighted to find that this site not only gave them a name (yutapon_cubes) but also had a bunch of examples. I can appreciate that these tags are sort of loose as you say, and shouldn't be taken too seriously, but I also think there can be a lot of value in having names for things, especially when they're a bit more archaic like the eye and the cubes. Names make them easier to talk about, think about, and find more info about, I think. To that end, I had actually already been skimming through the rest of the green tags already, it was just the two I asked about that had no info on them.

At any rate, good to know I was mostly on the right track. The info on the umakoshi_eye is interesting, if a bit beyond my depth. I suppose I wasn't much aware of the distinction between story boarding and animation, I am vaguely aware of the concept of story boarding but I'm used to thinking of animation as a term covering the whole process. Is it correct to say a story board is meant to lay out the broad strokes of each of the shots of a piece? But by that understanding, I'm surprised the eye makes it in there, given how brief it is in many cases. But I suppose it maybe still constitutes a significant movement of the camera, and maybe there is enough distinction in the shots before and after to have to treat them as separate shots anyway?

Well but regardless, thank you for confirming my understanding, and for the additional info!