Choose color 1 (blues), 2 (browns), or 3 (purples). See what max turn works best (I like about 25) for hill or mountain patterns. Gives "atmospheric perspective" (more distant regions with lower saturation). Hills or mountains generated by random turns with random steps forward.
Moves pen from left to right with random deviations. Each pen row has a deeper saturation and darker tone. This should create what artists call "atmospheric perspective" where further away areas of the landscape appear more washed-out, fuzzier. I tried to simulate that look with lower saturation and more brightness further away.
