Lots of good guesses this week! As many of you realized, this is a huge tree root making the best of a small tree pit. But it’s not a Norway maple (sorry John) or a mulberry (sorry Robert), but a sweetgum (Liquidambar styraciflua) (congratulations Brian!). (You can see the little mace-like seed pods on the ground.) The root does resemble a bicep (“Treebeard’s elbow”) flexing to crack the concrete (aka Robert’s Concretious blandmulsia):
Though sweetgum can be nice urban trees, their roots are quite vigorous and can lift sidewalks several inches above grade as they increase in diameter:
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Thanks for all the entries – our readers are smart and funny!
I really thought the beer bottle cap had something to do with it…
I tried to work that into my answer, somehow, but could not come up with a clever connection. How about you, John, or anyone else?
Maybe the tree developed the “bicep” by reaching for another cold one?