This is an arborglyph. As you can see on close inspection, it was etched in 1927, nearly 80 years ago! It's amazing to us to note

the tree seems to have survived and thrived in spite of its injury. We especially enjoyed finding this arborglyph

because it was created in the same year one of our group was born! Kinda cool, huh? For more information on arborglyphs, check here.