Memento mori is an artistic or symbolic trope acting as a reminder of the inevitability of death. 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.
Mindfulness is the practice of purposely bringing one's attention in the present moment without evaluation, a skill one develops through meditation or other training.
Mindfulness derives from sati, a significant element of Buddhist traditions, and is based on Zen, Vipassanā, and Tibetan meditation techniques.
Though definitions and techniques of mindfulness are wide-ranging, Buddhist traditions explain what constitutes mindfulness such as how past, present and future moments arise and cease as momentary sense impressions and .