Unique in so many ways, this sentinel in the dunes is robust in materiality to withstand the coastal weather, yet recessive in appearance with its black-oxide concrete shell peering out over the landscape. Circular in form and as a functional requirement, it provides uninterrupted surveillance out to sea and along the coastline. This highly functional building peels away from the often-relentless wind while providing a calm and focussed environment for observation and patrol – its rugged aesthetic transferring to the concealed spiral stair, executed with superb utilitarian detailing. A sophisticated, ingenious response to a harsh environment, this innovative and commanding design is immediately recognisable for the important purpose it serves.