What it is
Life-in-weeks visualization instrument. Renders an entire human lifespan as a finite grid and overlays lived versus remaining weeks.
Forces time-scale reckoning. Functions as the existential frame above MORTEM (which records the heartbeat) and CLOS (which schedules the day).
Where it sits
MEMENTO is catalogued under Cognitive Systems in the instrument registry. Instruments in this group share a concern and are frequently composed rather than used alone; the related entries below are the nearest ones.
This is a registry entry: a real instrument, documented here, without a public endpoint a stranger can open. Pages carrying source excerpts and measured results are marked as such in the catalog. If you want detail on this one specifically, ask about it directly.