For How to Tell, I think what I really want to do is work backwards . . . or, from the end, back to the top and fill in. I suddenly felt the right thing for the piece was to close with a sort-of-chorale, and that this ending will furnish the intervalic materials for the rest of the piece.
As a result, too, I am thinking of making the brief patch of music wanted for the animation-in-progress perfectly independent. For one thing, I still haven’t met with the animator (to discuss the work frame-by-frame-ish, at least), so I still don’t want to go into that conversation with too much music settled in aforehand.