A Monacelli title. Not available for purchase outside North America on Phaidon.com. Before dawn one morning in October 2016, renowned New York-based floral designer Lewis Miller stealthily arranged hundreds of brightly colored dahlias, carnations, and mums into a psychedelic halo around the John Lennon memorial in Central Park. The spontaneous floral installation was Miller's gift to the city—an effort to spark joy during a difficult time. Five years and more than ninety Flower Flashes later, these elaborate flower bombs—bursts of...