the.com/outsider
The person not in the room, which is precisely why they see the room clearly.
means Someone who doesn't belong to a particular group, place, or circle of insiders.
from Plain English carpentry: outside plus -er, attested by the 1800s for those beyond a boundary, then a wall around social belonging.
Horse racingAn outsider is a horse few expect to win.
CamusHis novel The Stranger is titled L'Etranger, also outsider.
Art worldOutsider art means self-taught, made beyond the gallery system.