Living on the edges of our normal perception, mosses are a common yet unremarkable element of the natural world. We only occasionally notice them in the cracks of city pavement, on tree trunks, or on the surfaces of rocks. Bryologist Robin Wall Kimmerer's book is neither an identification guide nor a scientific treatise. Rather, it is a series of interconnected personal essays about the lives of mosses, intertwined with the lives of countless other creatures, from salmon and hummingbirds to fungi, bacteria, and rural gardeners. Kimmerer compellingly explains moss biology while simultaneously reflecting on what these fascinating organisms can teach us. Drawing on her varied experiences as a scientist, mother, Native American, and professional observer accustomed to looking closely to see what matters, Robin Wall Kimmerer tells the diverse stories of mosses in scientific terms but also within the framework of indigenous ways of knowing. In her book, the natural history and cultural relationships of mosses become a powerful metaphor for the way we live in the world.