How Supreme Court Justices communicate with Each Other

Justice Kagan:

"Or we write memos to each other," she continued.

"And you know, you have to remember that the Court is an institution where ... we're not horse trading. We're not bargaining. We're reasoning. And we're trying to persuade people. And often 

the best way to do that is by putting things down on paper in a kind of careful and deliberate way

the best way to do that is by putting things down on paper in a kind of careful and deliberate way and saying this is what I think and, and giving people an opportunity to read a memo and to think about it and to reflect on it," she said.

"And so we do a lot of our communicating by these, it looks, it's sort of 19th century. It's very heavy ivory paper — it looks like it came out of the 1800s or something. But it seems to work pretty well," she added. "And when you think about it, how many emails have you sent that you wished you could take back? So, so we're careful and deliberative."

That remark about the paper they use makes me wonder if the memos are handwritten, too.