While #YOLO (“You only live once”) has been lauded as the battle cry of our youths, the sentiments expressed by the phrase are actually much older. Centuries before the invention of the hashtag, artists have reminded us of the transience of life, and have directed us to consider our own mortality. In doing so, they used memento mori, which are symbols that remind an artwork’s viewers of the inevitability of death, thereby forcing them to reflect on their own lives.