Instead of table tops which Spoerri usually used as a bottom layer, we find here old type-cases. The title of the series has a double meaning as both type-cases and mailbox. For Spoerri the letters are the raw material for all sorts of stories and narratives, the written and unwritten ones. “With these letters you could write all the world’s letters. Again these are the background, so to speak the canvas or the backdrop in the theater, on which these letters would be written and in the foreground are the implied dramas, which are only hinted at, which however everyone has to tell to himself.