The “model,” which I called Prompt-Brush, consisted of a simple text box that people could use to send prompts, and me at the other end, with a stack of blank paper.

(From here on, we use “pile” to describe the two overall groups of paper and “stacks” the columns that they contain.) We assume that each stack is made up of standard sized sheets, which ...

January 13, 2017 at 7:42am GMT. At the end of Donald Trump’s press conference addressing fresh but unsubstantiated allegations of Russian ties, he gestured to a huge stack of folders next to him.