But the Romans also made a verb of scintilla: scintillare, which meant to sparkle. And the past participle of scintillare was scintillatus. And because things that sparkle are bright and interesting and attract our attention, we got the verb scintillate.
So one word came from the size of a spark, and the other from its brightness.
But scintilla has one third child who's not nearly as obvious. As the Roman Empire fell and declined, people forgot how to spell properly and some people changed scintilla to stincilla. That's why the French ended up with a verb estenceler meaning to decorate something with lots of sparkly things. And so Medieval English got the verb stencellen meaning to decorate with bright colours. And that's why the pattern that you use to apply decorations is called a stencil.
Not a scintilla of scintillation.
Sorry for the lacunose blogging. The new book has now finally been sent to the printers. Of which much, much more soon.
And hence, of course, Banksy