In a landscape, the apparent line between land or water and sky (see Zorlutuna); also, a boundary or separation between spaces (see Devine). The true horizon is often obstructed by geological formations, forests, and the built environment, barring direct sightlines to an open sky (see Bureau of Linguistical Reality). Symbolically, the horizon’s breadth and distance have come to denote futurity, hope, attainment, forecasting, warning, foretelling (see Robinsong).