North Warning System is Donovan Wylie's third and final book of photographs on the themes of vision and power in military architecture, and draws a close to his Tower Series. Surveying a radar station just inside the Canadian Arctic, Wylie examines the detection of invisible threats through unmanned observation posts in remote regions. The development of long-range bombers and missiles after the Second World War made Canada's arctic frontier vulnerable to attack from the air. This forced Canada and the United States to jointly construct a matrix of short and long-range radar...

Donovan Wylie's The Tower Series, now available as a complete set in a custom cardboard box, reveals the repetitive character of military conflict across diverse geographies and histories. The first book in the series is British Watchtowers (2007), which studies the lines of sight from surveillance posts along the Irish border, and reveals a kind of virtual environment that enveloped the border region of Northern Ireland. These towers, constructed in the mid-1980s primarily in the mountainous border region of South Armagh, were landmarks in a 30-year conflict in and over...