Every year, January 1st is celebrated as Public Domain Day, when a new batch of media ceases to be protected by national copyright law. While most countries' copyright expirations are based on a set period of time after a work's creator dies, US copyright expiration is based on the year a work was published. This, combined with changes to copyright law in 1978 and 1998, has meant that 2019 is the first year that any works have entered the US public domain due to copyright expiration in more than twenty years. To honor this momentous occasion, the online journal The Public Domain Review recently published this "Class of 2019" list highlighting some of the many works of literature, film, and art that are now in the public domain. Notable examples from this list are Robert Frost's New Hampshire (containing the well-loved poem "Stopping by Woods on a Snowy Evening"), Kahlil Gibran's immensely popular classic The Prophet, the silent film Our Hospitality starring Buster Keaton, and Pablo Picasso's paintings The Pipes of Pan and Paulo on a Donkey, all of which were published in 1923.