Rivulet I don't even.. just check this out.

Ah, it's by Daniel Temkin, author of Esoteric.codes. Makes sense.

Came here to share specifically with @Ivan Reese and to ask when can this be incorporated into ink?

I don't know anything about ink. I only think with sand now.

I’m so behind the times

i haven't spent a ton of time with the posts, but I came across these guides by Jo Wood (sections 5 and 6 are still TK) https://observablehq.com/@jwolondon/rivulet-intro?collection=@jwolondon/rivulet