An fbm heightfield read as a cartographic contour map: evenly spaced isolines ring the terrain, every fifth an emphasised index contour, over a hypsometric tint that climbs from green lowlands through tan to snow-white peaks. A drifting sea level floods the basins with depth-shaded blue and a crisp coastline traces the shore. The whole terrain slowly undulates and drifts. Hover to raise or lower the sea, scroll to change the contour interval, and press to switch to a blueprint palette.