Knitfiti is the inspired practice of wrapping urban elements—from bike racks and benches to stop signs and tree trunks—in colorful 3-D yarn. Also known as “yarn bombing,” it’s traditionally performed in stealth. Anything is fair game. I’ve seen tree trunks, bikes, fire hydrants, stop signs and ugly scaffolding all brightened by cheerful knitted or crocheted tubes.

Poetry bombing is less of a thing. Until now. A mysterious poet-tree lover has been glorifying the Upper West Side’s blossoming cherry trees with A. E. Houseman’s poem, “Loveliest of Trees.” My first sighting (above) was tied with purple ribbon to a townhouse iron fence; my second (below) hung off a mighty branch in Riverside Park. Both were printed on three hole-punched binder paper, protected by a plastic sleeve, and blotched purple from the morning rain. I stopped to read the poem and admire the tree in both locations. It was urban “Versifiti” at its best.