Memento Mori as emblem and concept

Above are some images of the memento mori, a visual trope in Western European art and culture alluded to in the title of Jonathan Nolan's short story. You can see both early renditions (including Hans Holbein's famous and famously bizarre memento mori from his painting titled, The Ambassadors. The original painting can be seen here, and the resolution of the anamorphism here) as well as a contemporary version as self portrait by Sarah Lucas.

The Latin term, memento mori, translated literally as "remembrance of mortality," or more colloquially as "remember you will die," linked with an ensemble of shorthand images for death, has been a leit motif in Western European religious art and tombstone design since medieval times. Examples of this tradition can still be seen in many graveyards, where older tombstones combine phrases like memento mori and hora fugit ("time flies") with images of hourglasses, skulls, and bones. Thus, passersby are asked to remember not only the deceased but their own mortality as well.

The emblem of the memento mori entered Western European religious art sometime after 1300. Not only did it make use of the pairing of the skull with some image of life (a flower, etc.) but was expanded into narrative forms as well. The common motif of "the Dance of Death" often featured skeletal figures leading people of every social class in a conga line of mortality. Other narrative paintings depicted a typical everyday routine interrupted by some striking reminder of the Big Narrative Closure---Death.

Coupled with religious sermons, the images have a clear meaning: life is short, you can't take it with you, so make sure you are living a good (Christian) life so you avoid hell and enjoy heaven. However, when memento mori images appear apart from explanatory sermons and verses, their signification can become ambiguous. Being reminded of one's mortality can lead in directions that Christian religious authorities would not approve: memento mori can easily become carpe diem. Because life is short, we should enjoy its pleasures while they last.