One morning, this past fall, Jeremy Dennis, a thirty-two-year-old photographer, set out from the southern tip of the Shinnecock Indian Reservation, on the east end of Long Island, to make a picture of a neck of land called Sebonac, on the southeast edge of …One morning, this past fall, Jeremy Dennis, a thirty-two-year-old photographer, set out from the southern tip of the Shinnecock Indian Reservation, on the east end of Long Island, to make a picture of a neck of land called Sebonac, on the southeast edge of …