Design is a word that's come to mean so much that it's also a word that has come to mean nothing.
No one in the whole movie ever asks anyone, Did you write this letter' Part of the reason is that no one wants to hear that it isn't for them. As soon as they read it, they want it to be theirs.
When I write for 'n+1,' I begin by doing a lot of reading, to try to convince myself I'm not stupid. Then I scribble down a paragraph here, a paragraph there, when a notion strikes. Then I see if I can arrange those notions in a way that yields an argument.