Enchanter's Writ

With a wave of your hand, you conjure a 3 foot long scroll and quill that float in the air before you.  For the duration of the spell, the quill will write messages on the scroll.  You do not need to speak in order to determine what is written.  The text is visible to other creatures.  If the quill fills the length of the scroll before the spell ends, the text at the top will begin vanishing and be replaced by the new text, erasing the old as it progressed downward.