"This piece was a particular challenge for Airy who had to work with great speed to capture the colour of the molten shells. The tremendous heat of the interior added to the intensity, and one one occassion the ground became so hot that her shoes were burnt off her feet." image: The interior view of a shell forge showing the glowing hot shell cases emerging from the furnaces on the left of the composition. Munitions workers man the furnaces on the left; in the foreground is the back of a worker leaning over a glowing hot shell case. Sunlight streams in though the windowless wall on the right of the forge.