the.com/vanishing point

means The point in a perspective drawing where parallel lines appear to converge and disappear, usually on the horizon.

from Born in the studios of Renaissance artists wrestling with how to make flat panels hold deep space — the term in English dates to discussions of linear perspective, the geometric system credited to Italian Renaissance painters and architects. 'Vanishing' names exactly what the eye does: watch train tracks or a long hallway recede until they seem to pinch shut at a single spot. The phrase later wandered out of art theory into everyday language for any point where things fade from view or from possibility — but its home is the drafting table, where painters first ruled lines toward a spot that doesn't exist, to trick the eye into seeing one that does.