Contour map of flowing noise — designer-grade line-work.

The noise field is multiplied by twelve and reduced to its fractional part, turning a smooth height map into twelve repeating bands. Measuring each pixel's distance from the nearest band edge and thresholding it draws the iso-lines — the same construction a real contour map uses, so line density genuinely reads as slope steepness. Amber-to-blue terrain behind, lime contours in front, everything drifting at the slowest rate in the batch. Ideal for anything about mapping, data or terrain.