There is a long history of Memento Mori reminders, including coins. Shire Post Mint added their spin on the concept and included a new Memento Vivere reverse side.

Memento mori (Latin: "Remember that you have to die.") is the medieval theory and practice of reflection on mortality. Especially as a means of considering the vanity of earthly life and the transient nature of all earthly goods and pursuits.

Memento vivere (Latin: "Remember you have to live.") Know that your time is short in the grand scheme of things. So make if worthwhile when you're here.