The cover note accompanying this mysterious missive, sealed with wax and dated 12/02/1963, says, “Please file it unopened, with the date carefully noted. It is the outline for a play, and I have no means of copyrighting it except this way. The material is eminently stealable and I’m discussing the matter with people of similar ambitions.” The current possessors of the letter, the Stage Directors and Choreographers Society, don’t plan to open it just yet, but they are choosing five choreographers to create short pieces based on what they imagine the letter says.