Memento Mori. (Outro).
In ancient Rome, this phrase was pronounced during triumphal procession of Roman generals returning with victory. A slave was placed behind back of commander, who was obliged to periodically remind triumphant that, despite his glory, he remained mortal. Perhaps real phrase was: Respice post te! Hominem te memento! ("Turn around! Remember that you are man!") (Chapter 33 of Tertullian's Apologetics).
Collection with Aura: "My Wonderland".
Part II (additional edition).