Concrete at War photo exhibition by Mark Wrigley.

Concrete at War is a photographic study documenting Britain’s coastal wartime defences. […]

The exhibition features ‘sound mirrors,’ an ingenious acoustic method for detecting enemy aircraft developed between the two world wars. This technology was remarkably analogue, requiring minimal electronics, with amplification provided simply through stethoscopes. The collection includes a 3D printed model of the imposing 30-foot sound mirror at Dungeness—the product of a lockdown project meticulously modelled entirely from web-sourced imagery.