'To send a letter is a good way to go somewhere without moving anything but your heart', so said essayist Phyllis Theroux.
Letters are a staple of literature, from Horace's epistles addressed to fellow writers, patrons, and Emperor Augustus to 'Howlers' delivered to Hogwarts by owl. From Cecile's letters to God in The Color Purple to The Letter by Wilfred Owen.
If you could write to absolutely anyone in the world or out of it - another person or even your past or future self - knowing they wouldn't write back, what would you say? You could write an actual letter or epistolary poem; or write about what writing letters or other sorts of written communication means to you at the moment, if anything, when we aren't seeing friends and family in person.