Seeing blue dots, red Xs, orange circles and purple bands on trees and wondering what they mean? Here's what we found out about those painted trees.

You're enjoying a peaceful hike in the woods surrounded by lush greenery, including a lone tree with a red marking spray-painted on its trunk. It's easy to dismiss as the work of vandals (ugh, why can ...

Paintings in the Joslyn Art Museum, Coll. Checklist, July 1970. https://siris-artinventories.si.edu/ipac20/ipac.jsp?&profile=ariall&source=~!siartinventories&uri=full ...

Whether you’re walking along a city sidewalk or hiking deep in the forest, you might occasionally notice paint marks on tree trunks (or even a metal band once in a while). Those paint marks are codes ...