Memento Mori

Memento mori (Latin for "remember (that you have) to die")[2] is an artistic or symbolic trope acting as a reminder of the inevitability of death.[2] The concept has its roots in the philosophers of classical antiquity and Christianity, and appeared in funerary art and architecture from the medieval period onwards. The most common motif is a skull, often accompanied by bones. Often, this alone is enough to evoke the trope, but other motifs include a coffin, hourglass, or wilting flowers to signify the impermanence of life. Often, these would accompany a different central subject within a wider work, such as portraiture; however, the concept includes standalone genres such as the vanitas and Danse Macabre in visual art and cadaver monuments in sculpture... The philosopher Democritus trained himself by going into solitude and frequenting tombs.[5] Plato's Phaedo, where the death of Socrates is recounted, introduces the idea that the proper practice of philosophy is "about nothing else but dying and being dead".[6] The Stoics of classical antiquity were particularly prominent in their use of this discipline, and Seneca's letters are full of injunctions to meditate on death.[7] The Stoic Epictetus told his students that when kissing their child, brother, or friend, they should remind themselves that they are mortal, curbing their pleasure, as do "those who stand behind men in their triumphs and remind them that they are mortal".[8] The Stoic Marcus Aurelius invited the reader (himself) to "consider how ephemeral and mean all mortal things are" in his Meditations. https://en.wikipedia.org/wiki/Memento_mori