in the forest
the footfalls of moss

Given haiku’s extreme concision, it is sometimes necessary to adjust the facts to fit the reality of an insight. In this case, the tar paper roof is not on a shack, exactly, but a corncrib-like feeder for deer. (This is a former hunting camp acquired by a land conservancy and just transferred to the public in the form of new Pennsylvania state forest land.) But there are plenty of hollows around here where people are poor enough to inhabit shacks with roofs very like this one, so if readers imagine that kind of scenario, they’re not wrong.