Attribution and copyright for these beautiful images.

By Eugene Zelenko (Own work) [GFDL or CC BY-SA 4.0-3.0-2.5-2.0-1.0], via Wikimedia Commons

By Prg (Own work) [GFDL or CC-BY-SA-3.0], via Wikimedia Commons

By Davidlohr Bueso from California, US (forest of nisene marks) [CC BY 2.0], via Wikimedia Commons