This is a sound mirror in Denge, UK. Over the years we have continually bumped up against these concrete ears. Their initial 1920s function (to hear approaching enemy aircraft) was quickly usurped by advances in radar but the mirrors have endured in their second, off-label job as a cultural phantom. See Brian Dillon’s article in Cabinet magazine, Listening for the Enemy, for a glimpse at the mirrors’ current spectral role.
ICI Accession # – 22095